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Isopods Stock Photos and Images
![. Bulletin - United States National Museum. Science. ISOPODS OF NORTH AMERICA. 171 five articles. The frontal lamina ha.s the large round disk of the base ventrally i)laced, not anteriorly directed. The first segment of tw thorax is a little longer than au}" of the others, and the seventh is shorter. The epimera of all the segments, from the second to the seventh, inclusive, are distinctly separated from the segment. They are narrow, with the posterior angle in the last four acutely produced beyond the posterior margin of the segments. The first two epimera are rounded posteriorly. A dis Stock Photo](https://c8.alamy.com/comp/RG60R9/bulletin-united-states-national-museum-science-isopods-of-north-america-171-five-articles-the-frontal-lamina-has-the-large-round-disk-of-the-base-ventrally-ilaced-not-anteriorly-directed-the-first-segment-of-tw-thorax-is-a-little-longer-than-auquot-of-the-others-and-the-seventh-is-shorter-the-epimera-of-all-the-segments-from-the-second-to-the-seventh-inclusive-are-distinctly-separated-from-the-segment-they-are-narrow-with-the-posterior-angle-in-the-last-four-acutely-produced-beyond-the-posterior-margin-of-the-segments-the-first-two-epimera-are-rounded-posteriorly-a-dis-RG60R9.jpg ". Bulletin - United States National Museum. Science. ISOPODS OF NORTH AMERICA. 171 five articles. The frontal lamina ha.s the large round disk of the base ventrally i)laced, not anteriorly directed. The first segment of tw thorax is a little longer than au}" of the others, and the seventh is shorter. The epimera of all the segments, from the second to the seventh, inclusive, are distinctly separated from the segment. They are narrow, with the posterior angle in the last four acutely produced beyond the posterior margin of the segments. The first two epimera are rounded posteriorly. A dis Stock Photo")
RMRG60R9–. Bulletin - United States National Museum. Science. ISOPODS OF NORTH AMERICA. 171 five articles. The frontal lamina ha.s the large round disk of the base ventrally i)laced, not anteriorly directed. The first segment of tw thorax is a little longer than au}" of the others, and the seventh is shorter. The epimera of all the segments, from the second to the seventh, inclusive, are distinctly separated from the segment. They are narrow, with the posterior angle in the last four acutely produced beyond the posterior margin of the segments. The first two epimera are rounded posteriorly. A dis
![. Bulletin - United States National Museum. Science. ISOPODS OF NORTH AMERICA. 101 exterior margin near tlie posterior extremity. The exterior margin of this branch is also crenulate above and below the emarg-ination. Below the emargination the inner ])ranch is narrow and posteriorly ])ointed. The outer branch is half as wide as the inner branch, is acutely pointed, and terminates in a single long spine. It extends as far as the emargination in the exterior margin of the inner branch.. Please note that these images are extracted from scanned page images that may have been digitally enhanced fo Stock Photo](https://c8.alamy.com/comp/RG8575/bulletin-united-states-national-museum-science-isopods-of-north-america-101-exterior-margin-near-tlie-posterior-extremity-the-exterior-margin-of-this-branch-is-also-crenulate-above-and-below-the-emarg-ination-below-the-emargination-the-inner-ranch-is-narrow-and-posteriorly-ointed-the-outer-branch-is-half-as-wide-as-the-inner-branch-is-acutely-pointed-and-terminates-in-a-single-long-spine-it-extends-as-far-as-the-emargination-in-the-exterior-margin-of-the-inner-branch-please-note-that-these-images-are-extracted-from-scanned-page-images-that-may-have-been-digitally-enhanced-fo-RG8575.jpg ". Bulletin - United States National Museum. Science. ISOPODS OF NORTH AMERICA. 101 exterior margin near tlie posterior extremity. The exterior margin of this branch is also crenulate above and below the emarg-ination. Below the emargination the inner ])ranch is narrow and posteriorly ])ointed. The outer branch is half as wide as the inner branch, is acutely pointed, and terminates in a single long spine. It extends as far as the emargination in the exterior margin of the inner branch.. Please note that these images are extracted from scanned page images that may have been digitally enhanced fo Stock Photo")
RMRG8575–. Bulletin - United States National Museum. Science. ISOPODS OF NORTH AMERICA. 101 exterior margin near tlie posterior extremity. The exterior margin of this branch is also crenulate above and below the emarg-ination. Below the emargination the inner ])ranch is narrow and posteriorly ])ointed. The outer branch is half as wide as the inner branch, is acutely pointed, and terminates in a single long spine. It extends as far as the emargination in the exterior margin of the inner branch.. Please note that these images are extracted from scanned page images that may have been digitally enhanced fo
RMRG7Y11–. Bulletin - United States National Museum. Science. ISOPODS OF NORTH AMERICA. 3()7 anteriorly at the sides to sun-ound the postei-ior portion of the liead. All th(> seo-nients are equal in lenotii. The epinieron of the second se*;- nicnt extends half the length of the lateral iiiargin; it is broader at its anterior end than at its posterior end. The e|)iniera of the third and fouitli segments occupy the anterior two-thirds of the lateral margin. The epimeron of the fifth segment extends almost the entire length of the lateral margin of the segment. The epimera of the sixth and seventh segm
RMRG86F5–. Bulletin - United States National Museum. Science. ISOPODS OF NORTH AMERICA. 9 one-half mm. wide; the anterior maro-in is somewhat trianguhirly produced, with apex very obtuse. The eyes are small, composite, and situated at the antcro-lateral angles of the head. The tirst pair of antennas have the basal article very lono- and about equal to two-thirds the length of the head; the secoiid article is half as long as the first; the third is almost as long as the second; the terminal article is minute. The first pair of antennae are about 1 mm. in length. The second antennae have the first articl
RMRPXP3K–. Alaska ... Natural history; Scientific expeditions. ISOPODS 227 Family TRICHONISCIDJE. TRICHONISCUS PAPILLICORNIS sp. no/. Type from Seldovia, Cook Inlet, Alaska. Body covered with low tubercles. Color light brown. Head with sides produced at the antero-lateral angles in large lobes; front triangularly produced with a slight emargination at the apex of the triangle. Eyes situated on the lateral margins at the base of the antero-lateral lobes; they are small and black and appa- rently simple in structure. The peduncle of the antennae consists of five stout joints, the last three of which have
RMRHN5T9–. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. ISOPOD PIGMENTARY SYSTEM 471. FIGURE 5. Branch of an element of the pigmentary system in a land isopod (Porccllio laevis) : G indicates pigment granules ; M indicates mitochondria and CO indicates collagen. space between. The cytoplasm of the elements contains mitochondria, and little smooth endoplasmic reticulum, but no ribosomes or microtubles (Fig. 5). In contrast with land isopods, the marine forms possess individualized chromat- ophores (melanophores), in which there are a rich smooth reticulum, microfila- nients and mi
![. Bulletin - United States National Museum. Science. ISOPODS OF NORTH AMERICA. 621 The abdomen is as wide as tlie thorax. The first two segments have the hiteral ])arts covered i)y the hist thoracic segment. The sixth or terminal segment is triangidar, with apex produced to a long, narrow process rounded at the extremity. The terminal segment is 2 mm. wide at the base and li nun. long. The peduncle of the uropoda. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not Stock Photo](https://c8.alamy.com/comp/RG7N5W/bulletin-united-states-national-museum-science-isopods-of-north-america-621-the-abdomen-is-as-wide-as-tlie-thorax-the-first-two-segments-have-the-hiteral-arts-covered-iy-the-hist-thoracic-segment-the-sixth-or-terminal-segment-is-triangidar-with-apex-produced-to-a-long-narrow-process-rounded-at-the-extremity-the-terminal-segment-is-2-mm-wide-at-the-base-and-li-nun-long-the-peduncle-of-the-uropoda-please-note-that-these-images-are-extracted-from-scanned-page-images-that-may-have-been-digitally-enhanced-for-readability-coloration-and-appearance-of-these-illustrations-may-not-RG7N5W.jpg ". Bulletin - United States National Museum. Science. ISOPODS OF NORTH AMERICA. 621 The abdomen is as wide as tlie thorax. The first two segments have the hiteral ])arts covered i)y the hist thoracic segment. The sixth or terminal segment is triangidar, with apex produced to a long, narrow process rounded at the extremity. The terminal segment is 2 mm. wide at the base and li nun. long. The peduncle of the uropoda. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not Stock Photo")
RMRG7N5W–. Bulletin - United States National Museum. Science. ISOPODS OF NORTH AMERICA. 621 The abdomen is as wide as tlie thorax. The first two segments have the hiteral ])arts covered i)y the hist thoracic segment. The sixth or terminal segment is triangidar, with apex produced to a long, narrow process rounded at the extremity. The terminal segment is 2 mm. wide at the base and li nun. long. The peduncle of the uropoda. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not
RMRPXPCM–. Alaska ... Natural history; Scientific expeditions. ISOPOD CRUSTACEANS OF THE NORTHWEST COAST OF NORTH AMERICA BY HARRIET RICHARDSON CONTENTS. Systematic discussion of species 213 Bibliography 228 The present paper contains a list of the Isopods collected by the Harriman Alaska Expedition, and in addition a number of species from California received from Dr. William E. Ritter, head of the Zoological Department of the University of California.* Five species are described as new. A little-known species, Idotea gracillima (Dana) is figured for the first time and de- scribed more fully than here
RMRG7T1G–. Bulletin - United States National Museum. Science. ISOPODS OF NORTH AMERICA. 519. Fig. 565.—Munidion PARVTJM. Leg of SIXTH PAIR OF ADULT FEMALE. X 20i. all the segraents they are in the form of petiolated processes. The epimcra are large plates which occupy the whole of the lateral niaruin of the segments. These plates are larger on the posterior segments than on the anterior ones. The abdominal segments are all distinct. The first five are pro- duced laterally in epimeral lobes, elongated and leaf-shaped, decreas- ing in size gradually from the first to the fifth segments. These lobes do no
RMRG847W–. Bulletin - United States National Museum. Science. ISOPODS OF NORTH AMERICA. 149 to the first two taken together; the fourth and fifth are su))e(jual and each is nearly twice as long as the thii'd. The Hao-ellmn is composed of thirty-two articles. The s(>cond pair of antenna* extend to the poste- rior margin of the third thoracic segment. The maxilliped is com- posed of seven articles. The palp of the mandibles is composed of three articles. The frontal lamina is narrow and long, and has the anterior extremity rounded. The first segment of the thorax is nearW twice as long as any of those
RMRMP5HD–. The Annals and magazine of natural history; zoology, botany, and geology. Natural history; Zoology; Botany; Geology. Fior. 17.. 186 Miss H. Richardson on the Isopods of the The terminal segment has a large sinus in which are situated six sharp teeth. At the base of the sinus is a large tubercle. Three double tubercles are also found at the base of the terminal segment. The inner branch of the uropoda is affixed to the sides of the abdomen and extends two thirds of its length ; it is tri- angularly pointed at its extremity. The outer branch is long and slender, almost cylindrical in shape, sm
RMRG86B7–. Bulletin - United States National Museum. Science. ISOPODS OF NORTH AMEEICA. 17 The first three free seo-ineiits of the thorax are sul)equal; taken together, somewhat shorter than the head and twice as long as the foiu'th free segment. All the segments of the abdoiiuMi are pres- ent and visible. The last segment is taper- ing, wideh' rounded, and more than twice as wide as long. The first pair of legs are robust; the chelae are more than half as short as the head; the fingers are a little shorter than the hand, the thumb serrate almost to the apex. The ambulator}^ legs are all subequal, sle
RMRG851H–. Bulletin - United States National Museum. Science. ISOPODS OF NORTH AMERICA. Ill spine at the outer distal end, two spines on the ischium, with a long spine at the outer distal extremity. The specimen described is a very small one. The larcrer specimens have a greater number of spines on the terminal abdominal segment. The number of spines varies from sixteen to twenty-six, twenty to twenty-two being the average number.. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations
RMRMP59R–. The Annals and magazine of natural history; zoology, botany, and geology. Natural history; Zoology; Botany; Geology. 324 Miss H. Richardson on the Isopods oj the The terminal segment is produced backward at the sides into two sliarply pointed angulations, with a broad triangulate central lobe between, to which the uropoda are attached. Fig. 29.. lanthe trian(/ulata. X 13| The uropoda are longer than the terminal segment, the outer branch somewhat shorter than the inner one, and both fringed with hairs. First pair of legs prehensile, remaining pairs simple. Two specimens were collected by Mr.
RMRGARW9–. Bulletin of the Southern California Academy of Sciences. Science; Natural history; Natural history. Figure 1. Caudal vertebra number 6 (A) and number 15 (B) of Anolis barkeri (both X 10), and number 6 (C) and 15 (D) of Anolis sminthus (both XI8). The remaining food items included arachnids, diplopods, isopods, and gastropods, none of which are considered to have been associated with the aquatic environment. They could all have fallen or been brought into the streams by rains or rising waters. A rapid rise in stream level was observed on several occasions on the Rio Quezalapam following heavy
RMRHKRPJ–. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. EDOTEA ASSOCIATED WITH MYTILUS 109 Influence of the isopod on mussel meat content To find whether isopod occupation influenced the meat content of Mytilus chilensis, the dry-tissue weights of the mussels with and without isopods were plotted against shell lengths (Fig. 2). Regression lines and covariance analysis (Sokal and Rohlf, 1969; Rohlf and Sokal, 1969) showed no such influence on meat content. Furthermore, from microscopic investigations, especially on the very del- icate gills, it appears that specimens of Edotea mag
RMRPXNTY–. Alaska. Natural history -- Alaska; Scientific expeditions; Alaska. ISOPOD CRUSTACEANS OF THE NORTHWEST COAST OF NORTH AMERICA BY HARRIET RICHARDSON CONTENTS. Systematic discussion of species 213 Bibliography 228 The present paper contains a list of the Isopods collected by the Harriman Alaska Expedition, and in addition a number of species from California received from Dr. William E. Ritter, head of the Zoological Department of the University of California.* Five species are described as new. A little-known species, Idotea gracillima (Dana) is figured for the first time and de- scribed more
![. College collection of palaeontology. No. 141. [1316, Cast]. Euproops Danae, M. & W. This ancient King-Crab is interesting on account of its resemblance to the larval form of the modern Limulus, and still closer to the Carboniferous Trilobite Prestwichia. The original is from the Coal Measures of Grundy Co., 111., and in possession of Ward & Howell.. ORDER TRILOBITA. These extinct crustaceans were the earliest members of tlie class, meetina; iis in the first formations in which we have any abundant forms of marine life. Tliey resemble both the Ento- mostracans and Isopods, and are nea Stock Photo](https://c8.alamy.com/comp/REHD2M/college-collection-of-palaeontology-no-141-1316-cast-euproops-danae-m-amp-w-this-ancient-king-crab-is-interesting-on-account-of-its-resemblance-to-the-larval-form-of-the-modern-limulus-and-still-closer-to-the-carboniferous-trilobite-prestwichia-the-original-is-from-the-coal-measures-of-grundy-co-111-and-in-possession-of-ward-amp-howell-order-trilobita-these-extinct-crustaceans-were-the-earliest-members-of-tlie-class-meetina-iis-in-the-first-formations-in-which-we-have-any-abundant-forms-of-marine-life-tliey-resemble-both-the-ento-mostracans-and-isopods-and-are-nea-REHD2M.jpg ". College collection of palaeontology. No. 141. [1316, Cast]. Euproops Danae, M. & W. This ancient King-Crab is interesting on account of its resemblance to the larval form of the modern Limulus, and still closer to the Carboniferous Trilobite Prestwichia. The original is from the Coal Measures of Grundy Co., 111., and in possession of Ward & Howell.. ORDER TRILOBITA. These extinct crustaceans were the earliest members of tlie class, meetina; iis in the first formations in which we have any abundant forms of marine life. Tliey resemble both the Ento- mostracans and Isopods, and are nea Stock Photo")
RMREHD2M–. College collection of palaeontology. No. 141. [1316, Cast]. Euproops Danae, M. & W. This ancient King-Crab is interesting on account of its resemblance to the larval form of the modern Limulus, and still closer to the Carboniferous Trilobite Prestwichia. The original is from the Coal Measures of Grundy Co., 111., and in possession of Ward & Howell.. ORDER TRILOBITA. These extinct crustaceans were the earliest members of tlie class, meetina; iis in the first formations in which we have any abundant forms of marine life. Tliey resemble both the Ento- mostracans and Isopods, and are nea
![. The Cambridge natural history. Zoology. 76 CRUSTACEA COPEPODA are prehensile, but are not so fused. Besides Achtheres there are other fresh-water forms, e.ff. Lernaeoiwda salmonea on Salmon, and a number of marine genera. It appears that the larvae fix themselves to their hosts by means of a long glandular thread, which proceeds from the middle of the forehead.^ Fam. 13. Choniostomatidae."—The members of this family are all parasitic on other Crustacea. The majority live parasiti- cally in the marsupial pouches of female Amphipods, Isopods, Mysidae, and Cumacea, e.g. Sphaeronella and St Stock Photo](https://c8.alamy.com/comp/RG3X0X/the-cambridge-natural-history-zoology-76-crustacea-copepoda-are-prehensile-but-are-not-so-fused-besides-achtheres-there-are-other-fresh-water-forms-eff-lernaeoiwda-salmonea-on-salmon-and-a-number-of-marine-genera-it-appears-that-the-larvae-fix-themselves-to-their-hosts-by-means-of-a-long-glandular-thread-which-proceeds-from-the-middle-of-the-forehead-fam-13-choniostomatidaequotthe-members-of-this-family-are-all-parasitic-on-other-crustacea-the-majority-live-parasiti-cally-in-the-marsupial-pouches-of-female-amphipods-isopods-mysidae-and-cumacea-eg-sphaeronella-and-st-RG3X0X.jpg ". The Cambridge natural history. Zoology. 76 CRUSTACEA COPEPODA are prehensile, but are not so fused. Besides Achtheres there are other fresh-water forms, e.ff. Lernaeoiwda salmonea on Salmon, and a number of marine genera. It appears that the larvae fix themselves to their hosts by means of a long glandular thread, which proceeds from the middle of the forehead.^ Fam. 13. Choniostomatidae."—The members of this family are all parasitic on other Crustacea. The majority live parasiti- cally in the marsupial pouches of female Amphipods, Isopods, Mysidae, and Cumacea, e.g. Sphaeronella and St Stock Photo")
RMRG3X0X–. The Cambridge natural history. Zoology. 76 CRUSTACEA COPEPODA are prehensile, but are not so fused. Besides Achtheres there are other fresh-water forms, e.ff. Lernaeoiwda salmonea on Salmon, and a number of marine genera. It appears that the larvae fix themselves to their hosts by means of a long glandular thread, which proceeds from the middle of the forehead.^ Fam. 13. Choniostomatidae."—The members of this family are all parasitic on other Crustacea. The majority live parasiti- cally in the marsupial pouches of female Amphipods, Isopods, Mysidae, and Cumacea, e.g. Sphaeronella and St
![. Bulletin - United States National Museum. Science. ISOPODS OF NORTH AMERICA. 425 mm. wide. Tlfo iniici- hraiicli is 1 mm. loiii:. I'l"' outer l)i-;iiicli is ruin-ower and sliolitlv shorter tliaii the inner Inancli.. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. United States National Museum; Smithsonian Institution; United States. Dept. of the Interior. Washington : Smithsonian Institution Press, [etc. ]; for sale Stock Photo](https://c8.alamy.com/comp/RG7WBB/bulletin-united-states-national-museum-science-isopods-of-north-america-425-mm-wide-tlfo-iniici-hraiicli-is-1-mm-loiii-ilquot-outer-li-iiicli-is-ruin-ower-and-sliolitlv-shorter-tliaii-the-inner-inancli-please-note-that-these-images-are-extracted-from-scanned-page-images-that-may-have-been-digitally-enhanced-for-readability-coloration-and-appearance-of-these-illustrations-may-not-perfectly-resemble-the-original-work-united-states-national-museum-smithsonian-institution-united-states-dept-of-the-interior-washington-smithsonian-institution-press-etc-for-sale-RG7WBB.jpg ". Bulletin - United States National Museum. Science. ISOPODS OF NORTH AMERICA. 425 mm. wide. Tlfo iniici- hraiicli is 1 mm. loiii:. I'l"' outer l)i-;iiicli is ruin-ower and sliolitlv shorter tliaii the inner Inancli.. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. United States National Museum; Smithsonian Institution; United States. Dept. of the Interior. Washington : Smithsonian Institution Press, [etc. ]; for sale Stock Photo")
RMRG7WBB–. Bulletin - United States National Museum. Science. ISOPODS OF NORTH AMERICA. 425 mm. wide. Tlfo iniici- hraiicli is 1 mm. loiii:. I'l"' outer l)i-;iiicli is ruin-ower and sliolitlv shorter tliaii the inner Inancli.. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. United States National Museum; Smithsonian Institution; United States. Dept. of the Interior. Washington : Smithsonian Institution Press, [etc. ]; for sale
RMRHK8MX–. A biology of Crustacea. Crustacea. 126 A BIOLOGY OF CRUSTACEA of the ocean floor. The long setae on the front legs of Platymaia may be used as a rake for separating edible material from the ooze, and the fantastic chela of Thamnastocheles might also be used for a similar purpose. Another peculiarity of the deep-water Crustacea is that they are often larger than their close relatives from shallower water. The most striking example of this is the isopod Bathynonius giganteus, which reaches a length of ten inches; among other isopods a length of three inches is exceptional. Among the Tanaidacea
RMRDKY4C–. The Cambridge natural history. Zoology. 76 CRUSTACEA COPEPODA are prehensile, but are not so fused. Besides Achtheres there are other fresh-water forms, e.ff. Lernaeopoda salmonea on Salmon, and a number of marine genera. It appears that the larvae fix themselves to their hosts by means of a long; glandular thread, which proceeds from the middle of the forehead.-' Fam. 13. Choniostomatidae.^—^The members of this family- are all parasitic on other Crustacea. The majority live parasiti- cally in the marsupial pouches of female Amphipods, Isopods, Mysidae, and Cumacea, e.g. Sphaeronella and Ste
RMRG81GX–. Bulletin - United States National Museum. Science. ISOPODS OF NORTH AMERICA. 249 the head between thera and a little anterior to them curving down- ward, so that in a dorsal view the anterior margin seems slightly excavate. The eyes are very indistinct, and have almost disappeared; traces of them are seen on the lateral margins, halfway- between the anterior and the posterior margins. The first pair of antenna? are composed of eight articles and extend almost to the posterior margin of the head. The basal articles of the first pair of antenna^ are widely separated by a distance equal to 2
RMRG7W90–. Bulletin - United States National Museum. Science. ISOPODS OF NORTH AMKRKW. 427 S(»i»-monts of the thorax with the lateral niarghis of tho first seoiueiit slightly ('inaroiMatc aiitoriorly, the ciiiaro-inatioii hciiio- filled by the. Fig. 4si>.—Asicu.rs ATTKNi-ATrs.. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. United States National Museum; Smithsonian Institution; United States. Dept. of the Interior. Washington :
RMRGJG0F–. Bulletin of the British Museum (Natural History). A. 1 . RICE. Fig. 1 HMS Porcupine. A wooden, two-masted paddle gun-vessel, built at Deptford Dockyard in 1844, the Porcupine was 141 feet long and had a displacement of 490 tons. This rather poor photograph, apparently the only one of the ship in existence, is reproduced by kind permission of the Hydrographcr to the Navy. parts of the collections were never worked up adequately. In particular, with the exception of the isopods. very few of the crustaceans were reported upon at all except in The Depths of the Sea. In the case of the decapods,
RMRG7PY4–. Bulletin - United States National Museum. Science. ISOPODS OF NORTH AMERICA. 561. TicoLA. First incubatory LAMELLA. X 51|. parts large and expanded. On th(> shorter side they are less expanded and upeiirv ed, showing the legs. Ovarian bosses are not present on any of the segments. The lateral margins of all the segments of the expanded side ai-e entire with the exception of the secontl, which has a decided notch separating the anterior two- thirds from the posterior third. The epimera seem to be perfectly coalesced in all the seg- ments with the dorsal pai't of the segments. The segments
RMRMP5CG–. The Annals and magazine of natural history; zoology, botany, and geology. Natural history; Zoology; Botany; Geology. 276 Miss H. Richardson on the Isopods of the to tlie end of the second joint of the second pair of antennae. The first joint of the second pair of antennae is visible and unarmed; the second joint is armed with three spines ; the tliiid joint is unarmed and is about twice as long aa the second joint; the fourth and fifth joints are about equal in length and are each about twice as long as the third; the flagellum contains three joints. Fig. 28.. Please note that these images a
![. Bulletin - United States National Museum. Science. ISOPODS OF NORTH AMERICA. 457 Nine specimens were obtained by the llarrinian Expedition at Yakutat, Alaska. Thoy were collected ])y Mr. T. Kincaid, after whom the species is named. Five females and four males were collected. The legs of the first })air in the male are not greatly longer than the others; they are longer in the type species of '/(//> !rj>s!s. The very short superioi- antenna' with. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and a Stock Photo](https://c8.alamy.com/comp/RG7TW7/bulletin-united-states-national-museum-science-isopods-of-north-america-457-nine-specimens-were-obtained-by-the-llarrinian-expedition-at-yakutat-alaska-thoy-were-collected-y-mr-t-kincaid-after-whom-the-species-is-named-five-females-and-four-males-were-collected-the-legs-of-the-first-air-in-the-male-are-not-greatly-longer-than-the-others-they-are-longer-in-the-type-species-of-gt-!rjgts!s-the-very-short-superioi-antenna-with-please-note-that-these-images-are-extracted-from-scanned-page-images-that-may-have-been-digitally-enhanced-for-readability-coloration-and-a-RG7TW7.jpg ". Bulletin - United States National Museum. Science. ISOPODS OF NORTH AMERICA. 457 Nine specimens were obtained by the llarrinian Expedition at Yakutat, Alaska. Thoy were collected ])y Mr. T. Kincaid, after whom the species is named. Five females and four males were collected. The legs of the first })air in the male are not greatly longer than the others; they are longer in the type species of '/(//> !rj>s!s. The very short superioi- antenna' with. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and a Stock Photo")
RMRG7TW7–. Bulletin - United States National Museum. Science. ISOPODS OF NORTH AMERICA. 457 Nine specimens were obtained by the llarrinian Expedition at Yakutat, Alaska. Thoy were collected ])y Mr. T. Kincaid, after whom the species is named. Five females and four males were collected. The legs of the first })air in the male are not greatly longer than the others; they are longer in the type species of '/(//> !rj>s!s. The very short superioi- antenna' with. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and a
RMRG83KE–. Bulletin - United States National Museum. Science. ISOPODS OF NORTH AMERICA. 181 The first antennae extend to the posterior margin of the first thoracic segment. The first two articles of the peduncle of the second pair of antenna are short and about ecpial in Icnigth; tlie third is a little longer than the second; the fourth and fifth are subequal and each about twice as long as the third.' The fiagellum is conn)()sed of fifteen articles. The second pair of antenna' extend a little beyond the pos- terior margin of the second thoracic segment. The maxilliped has a palp of five articles. The
![. Bulletin - United States National Museum. Science. ISOPODS OF NORTH AMERICA. 195 by faint lie Hi-st is â ^('t^niont, is poste- (Miiity of and liar-. .^^^^K. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. United States National Museum; Smithsonian Institution; United States. Dept. of the Interior. Washington : Smithsonian Institution Press, [etc. ]; for sale by the Supt. of Docs. , U. S. Govt Print. Off. Stock Photo](https://c8.alamy.com/comp/RG839A/bulletin-united-states-national-museum-science-isopods-of-north-america-195-by-faint-lie-hi-st-is-tniont-is-poste-miiity-of-and-liar-k-please-note-that-these-images-are-extracted-from-scanned-page-images-that-may-have-been-digitally-enhanced-for-readability-coloration-and-appearance-of-these-illustrations-may-not-perfectly-resemble-the-original-work-united-states-national-museum-smithsonian-institution-united-states-dept-of-the-interior-washington-smithsonian-institution-press-etc-for-sale-by-the-supt-of-docs-u-s-govt-print-off-RG839A.jpg ". Bulletin - United States National Museum. Science. ISOPODS OF NORTH AMERICA. 195 by faint lie Hi-st is â ^('t^niont, is poste- (Miiity of and liar-. .^^^^K. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. United States National Museum; Smithsonian Institution; United States. Dept. of the Interior. Washington : Smithsonian Institution Press, [etc. ]; for sale by the Supt. of Docs. , U. S. Govt Print. Off. Stock Photo")
RMRG839A–. Bulletin - United States National Museum. Science. ISOPODS OF NORTH AMERICA. 195 by faint lie Hi-st is â ^('t^niont, is poste- (Miiity of and liar-. .^^^^K. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. United States National Museum; Smithsonian Institution; United States. Dept. of the Interior. Washington : Smithsonian Institution Press, [etc. ]; for sale by the Supt. of Docs. , U. S. Govt Print. Off.
RMRG85BT–. Bulletin - United States National Museum. Science. ISOPODS OF NORTH AMERICA. 93 The legs are slender, with the second article somewhat elongate; the first pair of legs arc manifestly stouter than the second pair of legs; the second and third pairs of legs have tlie fourth article pro- duced on the exterior side to the middle of the tifth article; the tifth and seventh pairs of legs are subequal; the second pair are somewhat longer and the sixth pair a little shorter. The anterior segments of the abdomen and tlie plcopoda are almost as in C. parva. The last segment of the abdomen is somewhat
RMRPXPBN–. Alaska ... Natural history; Scientific expeditions. ISOPODS 217 filiform, the thoracic segments subquadrate, head quadrate. He refers to the linear post-abdomen, which is truncated at the apex, three- jointed, and marked on either side with a suture. The antennae are described as being a httle shorter than half the body, with a ten- to twelve-jointed flagellum. No figure of the form has ever been given. A species of Idotea was sent to the U. S. National Museum by Dr. Ritter. The specimens, which are eight in number, were collected by him at Bolinas, California. They are more closely allied t
![. Bulletin - United States National Museum. Science. ISOPODS OP^ NORTH AMERICA. 87] Yakutat; Glacier Bay; (larfortli Island in Muir Inlet and Sitka, Alaska; Beaver Cove on Vancouver Island; Land's End, California; Gahnola. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. United States National Museum; Smithsonian Institution; United States. Dept. of the Interior. Washington : Smithsonian Institution Press, [etc. ]; for sale Stock Photo](https://c8.alamy.com/comp/RG7XX4/bulletin-united-states-national-museum-science-isopods-op-north-america-87-yakutat-glacier-bay-larfortli-island-in-muir-inlet-and-sitka-alaska-beaver-cove-on-vancouver-island-lands-end-california-gahnola-please-note-that-these-images-are-extracted-from-scanned-page-images-that-may-have-been-digitally-enhanced-for-readability-coloration-and-appearance-of-these-illustrations-may-not-perfectly-resemble-the-original-work-united-states-national-museum-smithsonian-institution-united-states-dept-of-the-interior-washington-smithsonian-institution-press-etc-for-sale-RG7XX4.jpg ". Bulletin - United States National Museum. Science. ISOPODS OP^ NORTH AMERICA. 87] Yakutat; Glacier Bay; (larfortli Island in Muir Inlet and Sitka, Alaska; Beaver Cove on Vancouver Island; Land's End, California; Gahnola. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. United States National Museum; Smithsonian Institution; United States. Dept. of the Interior. Washington : Smithsonian Institution Press, [etc. ]; for sale Stock Photo")
RMRG7XX4–. Bulletin - United States National Museum. Science. ISOPODS OP^ NORTH AMERICA. 87] Yakutat; Glacier Bay; (larfortli Island in Muir Inlet and Sitka, Alaska; Beaver Cove on Vancouver Island; Land's End, California; Gahnola. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. United States National Museum; Smithsonian Institution; United States. Dept. of the Interior. Washington : Smithsonian Institution Press, [etc. ]; for sale
RMRHG4KR–. The biology of marine animals. Marine animals; Physiology, Comparative. 166 THE BIOLOGY OF MARINE ANIMALS of acorn barnacles are not accelerated by decreased 02 or increased C02 tension in the water. Both decrease in 02 and increase in C02 quicken the rhythm of respiratory movements in Gammarus locusta but the effects are transitory. In amphipods and isopods generally, respiratory movements are performed by beating of pleopods, and the rate is accelerated by low 02 and high C02 tensions in most subaquatic species examined (Cirolana, Cymodoce, Idotea, Melita). Ventilation in stomatopods is ac
RMRH07EN–. Bulletin. Science; Natural history; Natural history. 24 SOUTHERN CALIFORNIA ACADEMY OF SCIENCES SCORPION HARBOR FRYS hiARBOR. SMUGGLERS COVE Fig. 1. Location of the 60 Santa Cruz Island sites examined in this study (see methods for criteria used in choosing collection sites). Closed circles represent sites where isopods were found. Open circles represent sites where apparently suitable habitat was examined but no isopods were found. Also indicated are locations from which oniscoids have been previously reported (see text), and the locations of the seven sites from which the Santa Barbara Mus
RMRG81GA–. Bulletin - United States National Museum. Science. ISOPODS OF NORTH AMERICA. 251 distance the posterior ani;-le of the .segment; thos(^ of the lifth pair ahnost reaeh the posterior angle of the segment; those of the sixth pair extend a small distance l)eyond the posterior angle of the segment. The legs of the lirst three pairs are shorter than the others; those of the last four pairs gradually but slightly increase in length. The unguL'e are long, rather stout, less curved and subequal in length. The carina of the four posterior pairs is high, graduall}' and greatly increasing in height, the
RMRG84WJ–. Bulletin - United States National Museum. Science. ISOPODS OB^ NORTH AMERICA. 115 The first pair of aiiteniuv hac the peduncle coiupo.sed of only two articles, both long and narrow; the second is a little longer than the first. The Hagclluni is composed of fourteen articles, and extends to the posterior niai'g'in of the second thoracic segment. The second pair of antenniB have the first three articles short and subequal; the f on rill and fifth articles are subequal in length, and each is as long as the first thi'ee articles taken together. The fiagellum is composed of thirty articles, and
![. Bulletin - United States National Museum. Science. ISOPODS OF NORTH AMERICA. 183 The first three segments of the thorax are sul)eqnal, each beuig" 3 mm. lonw". The fourth and seventh are subeqiial, and each is 3j mm. in length. The fifth and sixth are each 4 mm. in length. The epimera are distinctly separated on all the segments with the exception of the first. They are broad i)lates, with the outer post-lateral angles of the first two and the last two acute. All are crossed ob- li(iu(dy by an arched carina. All six segments of tiie abdomen are distinct. The sixth or terminal segme Stock Photo](https://c8.alamy.com/comp/RG83HW/bulletin-united-states-national-museum-science-isopods-of-north-america-183-the-first-three-segments-of-the-thorax-are-suleqnal-each-beuigquot-3-mm-lonwquot-the-fourth-and-seventh-are-subeqiial-and-each-is-3j-mm-in-length-the-fifth-and-sixth-are-each-4-mm-in-length-the-epimera-are-distinctly-separated-on-all-the-segments-with-the-exception-of-the-first-they-are-broad-ilates-with-the-outer-post-lateral-angles-of-the-first-two-and-the-last-two-acute-all-are-crossed-ob-liiudy-by-an-arched-carina-all-six-segments-of-tiie-abdomen-are-distinct-the-sixth-or-terminal-segme-RG83HW.jpg ". Bulletin - United States National Museum. Science. ISOPODS OF NORTH AMERICA. 183 The first three segments of the thorax are sul)eqnal, each beuig" 3 mm. lonw". The fourth and seventh are subeqiial, and each is 3j mm. in length. The fifth and sixth are each 4 mm. in length. The epimera are distinctly separated on all the segments with the exception of the first. They are broad i)lates, with the outer post-lateral angles of the first two and the last two acute. All are crossed ob- li(iu(dy by an arched carina. All six segments of tiie abdomen are distinct. The sixth or terminal segme Stock Photo")
RMRG83HW–. Bulletin - United States National Museum. Science. ISOPODS OF NORTH AMERICA. 183 The first three segments of the thorax are sul)eqnal, each beuig" 3 mm. lonw". The fourth and seventh are subeqiial, and each is 3j mm. in length. The fifth and sixth are each 4 mm. in length. The epimera are distinctly separated on all the segments with the exception of the first. They are broad i)lates, with the outer post-lateral angles of the first two and the last two acute. All are crossed ob- li(iu(dy by an arched carina. All six segments of tiie abdomen are distinct. The sixth or terminal segme
![. The Cambridge natural history. Zoology. !30 TRILOBITA alternating rows. In Trilobites with a conical eye the outer segment of the cone bears the visual surface. It has been stated that the eyes of Trilobites resemble those of Isopods/ but close comparison is difficult to make, since in Trilobites no part of the eye beneath the lenses is preserved. In some genera a thread- like ridge, called the " eye-line," passes from the glabella, generally from the front segment, to the eye, where it often ends in the palpebral lobe ; this eye-line is found in nearly all genera which are confine Stock Photo](https://c8.alamy.com/comp/RDKGM4/the-cambridge-natural-history-zoology-!30-trilobita-alternating-rows-in-trilobites-with-a-conical-eye-the-outer-segment-of-the-cone-bears-the-visual-surface-it-has-been-stated-that-the-eyes-of-trilobites-resemble-those-of-isopods-but-close-comparison-is-difficult-to-make-since-in-trilobites-no-part-of-the-eye-beneath-the-lenses-is-preserved-in-some-genera-a-thread-like-ridge-called-the-quot-eye-linequot-passes-from-the-glabella-generally-from-the-front-segment-to-the-eye-where-it-often-ends-in-the-palpebral-lobe-this-eye-line-is-found-in-nearly-all-genera-which-are-confine-RDKGM4.jpg ". The Cambridge natural history. Zoology. !30 TRILOBITA alternating rows. In Trilobites with a conical eye the outer segment of the cone bears the visual surface. It has been stated that the eyes of Trilobites resemble those of Isopods/ but close comparison is difficult to make, since in Trilobites no part of the eye beneath the lenses is preserved. In some genera a thread- like ridge, called the " eye-line," passes from the glabella, generally from the front segment, to the eye, where it often ends in the palpebral lobe ; this eye-line is found in nearly all genera which are confine Stock Photo")
RMRDKGM4–. The Cambridge natural history. Zoology. !30 TRILOBITA alternating rows. In Trilobites with a conical eye the outer segment of the cone bears the visual surface. It has been stated that the eyes of Trilobites resemble those of Isopods/ but close comparison is difficult to make, since in Trilobites no part of the eye beneath the lenses is preserved. In some genera a thread- like ridge, called the " eye-line," passes from the glabella, generally from the front segment, to the eye, where it often ends in the palpebral lobe ; this eye-line is found in nearly all genera which are confine
RMRG7TDJ–. Bulletin - United States National Museum. Science. ISOPODS OF NORTH AMERICA. 479 ing ones small, the last fring'ed with hairs. The socoiul pair of siiiten- mv have a rudimentary flagelluni, consisting of live or six joints; the peduncle has the third and fifth joints long and oval in shape, the fourth joint somewhat triangular. The thoracic segments are looselv articulated. The lateral mar- oins are straight, with no indication of epimera. The terminal segment of the body is rounded in outline, the posterior margin excavated at the insertion of the uropoda, which do not extend beyond the edg
RMRG855D–. Bulletin - United States National Museum. Science. ISOPODS OF NORTH AMERICA. 103 a little shorter than the first; the third is equal in length to the first two taken together. The flagellum is composed of twelve articles. The first antenntv extend to the end of the fourth article of the peduncle of the second antennae The first two articles of the second pair of antenntv are short; the second is shorter than the first; the third and fourth articles are about equal in length and each is as long- as the first two taken together; the fifth article is one and a half times longer than the fourth.
RMRPXNRP–. Alaska. Natural history -- Alaska; Scientific expeditions; Alaska. ISOPODS 217 filiform, the thoracic segments subquadrate, head quadrate. He refers to the hnear post-abdomen, which is truncated at the apex, three- jointed, and marked on either side with a suture. The antenna are described as being a httle shorter than half the body, with a ten- to twelve-jointed flagellum. No figure of the form has ever been given. A species of Idotca was sent to the U. S. National Museum by Dr. Ritter. The specimens, which are eight in number, were collected by him at Bolinas, California. They are more clo
![. Bulletin - United States National Museum. Science. ISOPODS OF N<mTH AMERICA. 279. The first segment of the abdomen hus three suture lines, and its pos- tei'ior margin is produced in two small points, one on each side of the median line, about equidistant from it and tlie lateral margin of the segment. The terminal segment is widel}' rounded posteriorly. The inner branch of the uropoda is of nearl}^ equal width throughout its length and is rounded at its extremit} ; the outer branch is slender and sharply pointed. Both ])ranehes are of nearly ecpial length and neither extends beyond tn t Stock Photo](https://c8.alamy.com/comp/RG8153/bulletin-united-states-national-museum-science-isopods-of-nltmth-america-279-the-first-segment-of-the-abdomen-hus-three-suture-lines-and-its-pos-teiior-margin-is-produced-in-two-small-points-one-on-each-side-of-the-median-line-about-equidistant-from-it-and-tlie-lateral-margin-of-the-segment-the-terminal-segment-is-widel-rounded-posteriorly-the-inner-branch-of-the-uropoda-is-of-nearl-equal-width-throughout-its-length-and-is-rounded-at-its-extremit-the-outer-branch-is-slender-and-sharply-pointed-both-ranehes-are-of-nearly-ecpial-length-and-neither-extends-beyond-tn-t-RG8153.jpg ". Bulletin - United States National Museum. Science. ISOPODS OF N<mTH AMERICA. 279. The first segment of the abdomen hus three suture lines, and its pos- tei'ior margin is produced in two small points, one on each side of the median line, about equidistant from it and tlie lateral margin of the segment. The terminal segment is widel}' rounded posteriorly. The inner branch of the uropoda is of nearl}^ equal width throughout its length and is rounded at its extremit} ; the outer branch is slender and sharply pointed. Both ])ranehes are of nearly ecpial length and neither extends beyond tn t Stock Photo")
RMRG8153–. Bulletin - United States National Museum. Science. ISOPODS OF N<mTH AMERICA. 279. The first segment of the abdomen hus three suture lines, and its pos- tei'ior margin is produced in two small points, one on each side of the median line, about equidistant from it and tlie lateral margin of the segment. The terminal segment is widel}' rounded posteriorly. The inner branch of the uropoda is of nearl}^ equal width throughout its length and is rounded at its extremit} ; the outer branch is slender and sharply pointed. Both ])ranehes are of nearly ecpial length and neither extends beyond tn t
![. Bulletin - United States National Museum. Science. ISOPODS OF NORTH AMERICA. 4U3 of the third and fourth soj^meiits are produced on each side into two acute processes—a larger anterior process and a smaHer posterior pro- cess. The epimera of these segments are inconspicuous, as they are small and acute, and lie just underneath the lateral parts about the middle of the segment. In the last three segments the anterior part of the segment is acutely produced, and the acute epimeron occupies the remainder of the lateral margin, the posterior half of the lateral part of the segment not ])eing pro Stock Photo](https://c8.alamy.com/comp/RG5Y54/bulletin-united-states-national-museum-science-isopods-of-north-america-4u3-of-the-third-and-fourth-sojmeiits-are-produced-on-each-side-into-two-acute-processesa-larger-anterior-process-and-a-smaher-posterior-pro-cess-the-epimera-of-these-segments-are-inconspicuous-as-they-are-small-and-acute-and-lie-just-underneath-the-lateral-parts-about-the-middle-of-the-segment-in-the-last-three-segments-the-anterior-part-of-the-segment-is-acutely-produced-and-the-acute-epimeron-occupies-the-remainder-of-the-lateral-margin-the-posterior-half-of-the-lateral-part-of-the-segment-not-eing-pro-RG5Y54.jpg ". Bulletin - United States National Museum. Science. ISOPODS OF NORTH AMERICA. 4U3 of the third and fourth soj^meiits are produced on each side into two acute processes—a larger anterior process and a smaHer posterior pro- cess. The epimera of these segments are inconspicuous, as they are small and acute, and lie just underneath the lateral parts about the middle of the segment. In the last three segments the anterior part of the segment is acutely produced, and the acute epimeron occupies the remainder of the lateral margin, the posterior half of the lateral part of the segment not ])eing pro Stock Photo")
RMRG5Y54–. Bulletin - United States National Museum. Science. ISOPODS OF NORTH AMERICA. 4U3 of the third and fourth soj^meiits are produced on each side into two acute processes—a larger anterior process and a smaHer posterior pro- cess. The epimera of these segments are inconspicuous, as they are small and acute, and lie just underneath the lateral parts about the middle of the segment. In the last three segments the anterior part of the segment is acutely produced, and the acute epimeron occupies the remainder of the lateral margin, the posterior half of the lateral part of the segment not ])eing pro
RMRG7TRA–. Bulletin - United States National Museum. Science. ISOPODS OF NORTH AMERICA. 463 as the width of the head. The second pair of antennre are ionoer than the body. The lateral iiiaro-in.s of the first segment are produced on either side into two angulations; those of the second and third into two, with the epiniera produced into two-lobed angulations; those of the fourth into two l()l)es, the small epimeral lobe or angulation between; and those of the tifth, sixth, and seventh into one large upper lobe and one small lower lo})e. The terminal segment is produced backward at the sides into two sh
![. Bulletin - United States National Museum. Science. ISOPODS OF NORTH AMERICA. 333 "It is closely allied to Arcturas anna and to Arcturiis cormitus^ but differs sufficiently from both to constitute the type of a new species.. Fig. 3fi4.—Arcturus purpureus (After Beddard). Dorsal view. "The extreme lenoth of the specimen, which is a female, is 18 mm., the lenoth of the antenni^ 31 mm.. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble t Stock Photo](https://c8.alamy.com/comp/RG7YM4/bulletin-united-states-national-museum-science-isopods-of-north-america-333-quotit-is-closely-allied-to-arcturas-anna-and-to-arcturiis-cormitus-but-differs-sufficiently-from-both-to-constitute-the-type-of-a-new-species-fig-3fi4arcturus-purpureus-after-beddard-dorsal-view-quotthe-extreme-lenoth-of-the-specimen-which-is-a-female-is-18-mm-the-lenoth-of-the-antenni-31-mm-please-note-that-these-images-are-extracted-from-scanned-page-images-that-may-have-been-digitally-enhanced-for-readability-coloration-and-appearance-of-these-illustrations-may-not-perfectly-resemble-t-RG7YM4.jpg ". Bulletin - United States National Museum. Science. ISOPODS OF NORTH AMERICA. 333 "It is closely allied to Arcturas anna and to Arcturiis cormitus^ but differs sufficiently from both to constitute the type of a new species.. Fig. 3fi4.—Arcturus purpureus (After Beddard). Dorsal view. "The extreme lenoth of the specimen, which is a female, is 18 mm., the lenoth of the antenni^ 31 mm.. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble t Stock Photo")
RMRG7YM4–. Bulletin - United States National Museum. Science. ISOPODS OF NORTH AMERICA. 333 "It is closely allied to Arcturas anna and to Arcturiis cormitus^ but differs sufficiently from both to constitute the type of a new species.. Fig. 3fi4.—Arcturus purpureus (After Beddard). Dorsal view. "The extreme lenoth of the specimen, which is a female, is 18 mm., the lenoth of the antenni^ 31 mm.. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble t
RMRG5XPF–. Bulletin - United States National Museum. Science. ISOPODS OF NORTH AMERICA. 489 rostrum which is truncate in front. On either side of the rostrum there is an emargination for the recei)tion of the basal articles of the first pair of antennte. Eyes wantnio-. Two small spines are situated on the posterior margin, one on either side of the median line. The tirst pair of antenna^ have the l)asal articles large and dilated. The second article is very small. The third article is about half as long as the second. The flagellum is composed of about twenty-nine articles. Fig. 540.—Munnopsis typic.
RMRG7XD0–. Bulletin - United States National Museum. Science. ISOPODS OE^ NORTH AMERICA. 885 three. The epinioni of all the .seg-ments are consolidated with the segments. The lateral margins are almost straight and continuous. The abdomen is composed of one segment, with lateral sutures at the base, indicating another partly coalesced segment; it tapers to a narrow extremity, the apex of which is emarginate. The legs are more or less alike in structure. SYNIDOTEA BICUSPIDA (Owen). Idotea hicuspida Owen, Crnstacea of the Blossom, 1839, p. 92, pi. xxvii, fig. 6. Idotea pidchra Lockington, Proc. Cal. Acad
RMRG7XYW–. Bulletin - United States National Museum. Science. ISOPODS OF NORTH AMERICA. 369 b. Terminal segment of body regularly and broadly rounded at its posterior extremity, with a very small and obtuse median tooth. Epimera of the sec- ond, third, and fourth segments do not extend ([uite the entire length of the segments. Those of the following segments occupy the entire lateral margin. Pentidotca trosnexentikii (Brandt) //. Terminal segment of body with pronounced post-lateral angles, which are rounded, and with a distinct and acute median tooth at its i)osterior extremity. c. Sides of thorax par
RMRDTDH3–. Zoology. Zoology. Fig. 114.—Qaviviarus robustus, from fresh water. Much enlarged. Isopods are broad and flat, the Amphipods are compressed, and the back is usually more or less arched. Such is the. Fig. IK.—Nebiilia hjpes. Enlarged 6 times. Gammariis, or beach-flea (Fig. 114), found in salt and fresh water. Order 5. PhyVocarida.—This group is represented by a little Crustacean, witli a compressed body, and broad leaf-. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations m
RMRG7X69–. Bulletin - United States National Museum. Science. ISOPODS OF NORTH AMERICA. 391. tubercles is a transverse row of three tubercles, the central one being in the median long-itudinal line and larger than either one of the others. The eyes are large and round, composite in structure, and situated a))out the middle of the head, a little distance from the lateral margins. The basal article of the tirst pair of antenna? is somewhat enlarged and almost twice as wide as the second article, which it equals in length; the third and fourth articles are subequal and each is about twice as long as the s
RMRHK9EM–. A biology of Crustacea. Crustacea. GROWTH AND LIFE HISTORIES 63 The old skeleton is split along definite pre-formed lines. In the lobster, for instance, the skeleton splits between the carapace and the abdomen, and the body is withdrawn through the hole leaving the old skeleton practically intact. In the isopods the skeleton is cast in two parts, and the front portion may be cast several days after the hind portion. Some Cladocera, such as Ilyocryptus and Monospilus, do not completely cast the carapace at each moult, so that they accumulate a series of carapaces on their back. One other clad
RMRG7YTP–. Bulletin - United States National Museum. Science. ISOPODS OF NORTH AMERICA. 325 article of the second antennae is short, and docs not extend beyond the antero-lateral angles of the head; the second article extends to the end of the first pair of antenna^; the third article is three times as long as the second article; the fourth is twice as long as the third; the fifth is a little shorter than the fourth. The flaoelluni is composed of three articles. The second antennae are not quite as long as the body, being 14 nun. in length. The maxilliped has a palp of five articles. The palp of the ma
![. Bulletin - United States National Museum. Science. ISOPODS OF NORTH AMERICA. 125 The thoracic segments are subequal. The epimeni arc nai-row, aiid those of the last three or four segments acutely pointed. All the al)doniinal segments are visible in a dorsal view. The ter- minal segment is rounded at the sides and truncate at its extremity, the lateral angles being produced in a short triangular process, between which the posterior margin is distincth' denticulate and ])ears four spines, which are about twice as long as the lateral teeth. The uropoda are short, not reaching the extremity of t Stock Photo](https://c8.alamy.com/comp/RG84KK/bulletin-united-states-national-museum-science-isopods-of-north-america-125-the-thoracic-segments-are-subequal-the-epimeni-arc-nai-row-aiid-those-of-the-last-three-or-four-segments-acutely-pointed-all-the-aldoniinal-segments-are-visible-in-a-dorsal-view-the-ter-minal-segment-is-rounded-at-the-sides-and-truncate-at-its-extremity-the-lateral-angles-being-produced-in-a-short-triangular-process-between-which-the-posterior-margin-is-distincth-denticulate-and-ears-four-spines-which-are-about-twice-as-long-as-the-lateral-teeth-the-uropoda-are-short-not-reaching-the-extremity-of-t-RG84KK.jpg ". Bulletin - United States National Museum. Science. ISOPODS OF NORTH AMERICA. 125 The thoracic segments are subequal. The epimeni arc nai-row, aiid those of the last three or four segments acutely pointed. All the al)doniinal segments are visible in a dorsal view. The ter- minal segment is rounded at the sides and truncate at its extremity, the lateral angles being produced in a short triangular process, between which the posterior margin is distincth' denticulate and ])ears four spines, which are about twice as long as the lateral teeth. The uropoda are short, not reaching the extremity of t Stock Photo")
RMRG84KK–. Bulletin - United States National Museum. Science. ISOPODS OF NORTH AMERICA. 125 The thoracic segments are subequal. The epimeni arc nai-row, aiid those of the last three or four segments acutely pointed. All the al)doniinal segments are visible in a dorsal view. The ter- minal segment is rounded at the sides and truncate at its extremity, the lateral angles being produced in a short triangular process, between which the posterior margin is distincth' denticulate and ])ears four spines, which are about twice as long as the lateral teeth. The uropoda are short, not reaching the extremity of t
RMRG7W53–. Bulletin - United States National Museum. Science. ISOPODS OF NORTH AMERICA. 437 segment, al)oiit one-litill' its k;ii<;tli. The piHluncle is about as lon^- as the inner branch. The outer branch is about one-fourth shorter than the inner branch. The tirst pair of leg's are subcluihite. The propodus is armed on the inferior margin with a triangular process near the distal end and with a long spine at the proximal extremity. The dactylus is armed with numerous spines along the inferior margin. All the other legs are ambulartory, with dactyli uni-unguiculate. CJE.CIDOTKA RICHARDSONiE Hay. Ci
RMRG85H1–. Bulletin - United States National Museum. Science. ISOPODS OF NORTH AMERICA. 85 The mandibles have a wide ciittino- edge. The maxillipeds are almost as in C. japonica. The segments of the thorax arc suhequal in length; the first seg- ment is somewliat shorter than the head and somewhat longer than the Hfth segment; the sixth and seven seg-ments are subequal in length and ornamented near the antei'ior margin with a transverse furrow. The epiniera are large, postei'iorly produced, and oblicpiely carinated (the carina terminating in a fork, very wide particularl}' in the posterior epimera, and
RMRG8635–. Bulletin - United States National Museum. Science. ISOPODS OF NORTH AMERICA. 47 while in A. intermedium the outer branch has only four joints, and the inner branch is only twice the length of the termimil abdominal seg- ment and is composed of only fifteen joints. 9. Genus PARAPSEUDES Sars. Exopods present on both pairs of gnathopods. Onl}^ four pairs of pleopoda present, with one of the branches two-jointed. Second pair of antennae with a scale articulated to the end of the second article. PARAPSEUDES GOODEI Richardson. Fampseudeii goodei Richardson, Trans. Conn. Acad. Sciencew,, XI, 1902,
RMRE3NBH–. Text book of zoology. Zoology. Sub-Class 2. Malacostraca. Order 4. Isopoda. 215 destitute of limbs; wlien they leave the brood-pouch they usually possess the general form of the perfect animal, but they still lack th.e last pair of thoracic legs. Some of the Isopods are marine, some fresh-water, and others terrestrial (in damp places). They are essentially adapted for walk- ing or for running, but some swim by means of the abdominal appendages. Many are parasitic. 1. In tlie Nortli Sea live, for example, several species of Idothea, relatively elongate animals, -with tlie last pair of abdomin
RMRG861F–. Bulletin - United States National Museum. Science. ISOPODS OF NORTH AMERICA. 57. Description of nullc—This species is closely related to Gnathia hirsuta (Sars), but ditt'ers from all other species of the genus in the structure of the mandibles. The l)ody is very short; the thorax is a litlle narrower than h>no' in the median line. The fourth free segment of th(^ thorax (fifth seg- ment) is scarcely longer than the fifth segment. Th(> tifth free seg- ment (sixth segment) has hirge latc^ral areas, posteriorly very much elongated, with the posterior angles subrotund. The abdomen in the sp
RMRHNWPM–. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. J. A. RIEGEL GNORIMOSPHAEROMA OREGONENSIS (EF) I I GNORIMOSPHAEROMA OREGONENSIS (FW) 2-- ---2 SPHAEROMA PENTODON 3---3 GNORIMOSPHAEROMA OREGONENSIS (BF) 4 4. 50 75 Medium Concentration(%SW) 125 FIGURE 2. Relation of the body fluid concentration to the medium concentration of animals exposed for 48 hours to the experimental salinities. water form lost chloride and died rapidly in that medium. It appears that the osmoregulatory abilities of the isopods in this study are intermediate between those of one group of crustaceans wh
RMRMNN89–. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum. Natural history. Contributions to the Crustacean Fauna of South Africa. 409 another family of Isopods : the Aegidae. It is regrettable that the male is unknown, but the form of the adult female is sufficiently distinctive. Aegoniscus n. g. Body of adult female ovoid, the lateral portions swollen into 6 large bilobulate ovigerous lobes, extending nearly from the medio- dorsal line to the medio-ventral line, completely hiding the ventral surface with its 6 pairs of valvular lamellae. No caudal projection. No fixing app
![. Bulletin - United States National Museum. Science. ISOPODS OF NORTH AMERICA. 253 downward in the middle; the anterior margin is rounded, the upper side slightl}' convex. '•The eyes are of median size, phiced a little behind the niiddk^ of the head near the lateral margins. "The lirst pair of antenna' are thick and robust, eight-jointed, with- out distinction between the peduncle and the tiagellum, the last joints without hairs oi spines. The second pair of antenna? are considera- bly more slender, a little shorter, eight-jointed. The processes of the first segment of the pereion are sho Stock Photo](https://c8.alamy.com/comp/RG81G0/bulletin-united-states-national-museum-science-isopods-of-north-america-253-downward-in-the-middle-the-anterior-margin-is-rounded-the-upper-side-slightl-convex-the-eyes-are-of-median-size-phiced-a-little-behind-the-niiddk-of-the-head-near-the-lateral-margins-quotthe-lirst-pair-of-antenna-are-thick-and-robust-eight-jointed-with-out-distinction-between-the-peduncle-and-the-tiagellum-the-last-joints-without-hairs-oi-spines-the-second-pair-of-antenna-are-considera-bly-more-slender-a-little-shorter-eight-jointed-the-processes-of-the-first-segment-of-the-pereion-are-sho-RG81G0.jpg ". Bulletin - United States National Museum. Science. ISOPODS OF NORTH AMERICA. 253 downward in the middle; the anterior margin is rounded, the upper side slightl}' convex. '•The eyes are of median size, phiced a little behind the niiddk^ of the head near the lateral margins. "The lirst pair of antenna' are thick and robust, eight-jointed, with- out distinction between the peduncle and the tiagellum, the last joints without hairs oi spines. The second pair of antenna? are considera- bly more slender, a little shorter, eight-jointed. The processes of the first segment of the pereion are sho Stock Photo")
RMRG81G0–. Bulletin - United States National Museum. Science. ISOPODS OF NORTH AMERICA. 253 downward in the middle; the anterior margin is rounded, the upper side slightl}' convex. '•The eyes are of median size, phiced a little behind the niiddk^ of the head near the lateral margins. "The lirst pair of antenna' are thick and robust, eight-jointed, with- out distinction between the peduncle and the tiagellum, the last joints without hairs oi spines. The second pair of antenna? are considera- bly more slender, a little shorter, eight-jointed. The processes of the first segment of the pereion are sho
RMRG84XT–. Bulletin - United States National Museum. Science. ISOPODS OF NORTH AMERICA. 113. sul)cqu!il :iMd each i.s about twice u.s lono- as the third. The tiag'cUuni is composed of thirty-two articles. The second pair of antennae extend to the fourth thoracic seg-inent. The inaxilliped is composed of seven articles. The palp of the mandibles is composed of three articles. The frontal lamina is broad and has th(» anterior maroin trian- guhirly produced, the apex be- ing rounded and meeting* the anterioi' })<)rti()n of the median point of the front of the head. The first thoracic segment is twice a
RMRG7W6G–. Bulletin - United States National Museum. Science. ISOPODS OF NORTH AMERICA. 485 soparated by a deep and wide inci.sioii between the segments. The segments are about eciual in length. Kpimcra are present on all the segments. On the tii-st thiee they .are small and narrow plates phu'(>d just below the antero-lateral angles. On the fourth segment they occupy the middle of the lateral margin. On the last three segments they are post- laterally placed. The first two segments of the abdomen are short. The third or terminal segment is narrow,. Fi(}. 491.—Cecidotea stygia. ((, Terminal seg- ment
![. Bulletin - United States National Museum. Science. ISOPODS OF NORTH AMERICA. 541. Fig. 582.—Phyllodurus abdominalis. Female (dorsal view). the last two segments the epimera occupy tlie post-lateral margin and are not separated from the segment. The abdomen is composed of six distinct segnKMits. The first seg- ment is provided on either side near the antero-lateral margin with a papillose process. This segment is nearly twice as long as an}" of the following seg- ments. The segments of the ai)d()men are successively narrower, gradually and rapidly tapering to the sixth or terminal segmen Stock Photo](https://c8.alamy.com/comp/RG7RNF/bulletin-united-states-national-museum-science-isopods-of-north-america-541-fig-582phyllodurus-abdominalis-female-dorsal-view-the-last-two-segments-the-epimera-occupy-tlie-post-lateral-margin-and-are-not-separated-from-the-segment-the-abdomen-is-composed-of-six-distinct-segnkmits-the-first-seg-ment-is-provided-on-either-side-near-the-antero-lateral-margin-with-a-papillose-process-this-segment-is-nearly-twice-as-long-as-anquot-of-the-following-seg-ments-the-segments-of-the-aidmen-are-successively-narrower-gradually-and-rapidly-tapering-to-the-sixth-or-terminal-segmen-RG7RNF.jpg ". Bulletin - United States National Museum. Science. ISOPODS OF NORTH AMERICA. 541. Fig. 582.—Phyllodurus abdominalis. Female (dorsal view). the last two segments the epimera occupy tlie post-lateral margin and are not separated from the segment. The abdomen is composed of six distinct segnKMits. The first seg- ment is provided on either side near the antero-lateral margin with a papillose process. This segment is nearly twice as long as an}" of the following seg- ments. The segments of the ai)d()men are successively narrower, gradually and rapidly tapering to the sixth or terminal segmen Stock Photo")
RMRG7RNF–. Bulletin - United States National Museum. Science. ISOPODS OF NORTH AMERICA. 541. Fig. 582.—Phyllodurus abdominalis. Female (dorsal view). the last two segments the epimera occupy tlie post-lateral margin and are not separated from the segment. The abdomen is composed of six distinct segnKMits. The first seg- ment is provided on either side near the antero-lateral margin with a papillose process. This segment is nearly twice as long as an}" of the following seg- ments. The segments of the ai)d()men are successively narrower, gradually and rapidly tapering to the sixth or terminal segmen
RMRG7RTC–. Bulletin - United States National Museum. Science. ISOPODS OF NORTH AMERICA. 531 The pleopoda are five pairs of large, ))road, smooth, leaf-like, double-branched appendages not cf)ncealed on the dorsal side by the small opimeral plates of the al)d()minal segments, from which they project in full view. The uropoda are a pair of single-branched, simple appendages, similar in shape to the branches of the pleopoda. The marsupium is formed of five pairs of incuba- tory lamella?, which overlap so as to completely encompass the ventral surface of the body; the first pair have the terminal lobe of t
![. Bulletin - United States National Museum. Science. ISOPODS OF NORTH AMERICA. 307 or tcrminiil .sogment has the convex anterior portion surmounted with two very inconspicuously small tubercles, one on either side of the median line. Its posterior exti'emity has a deep rounded excavation, almost(juadrangular in shape. The uropoda are longer than the t(n"minal abdomi- nal segment. The inner branch has the outer post-lateral angle produced in an acute point, the inner angle being rounded. The outer branch is longer than the inner branch, and terminates in an acutely pointed extremity. The m Stock Photo](https://c8.alamy.com/comp/RG80F7/bulletin-united-states-national-museum-science-isopods-of-north-america-307-or-tcrminiil-sogment-has-the-convex-anterior-portion-surmounted-with-two-very-inconspicuously-small-tubercles-one-on-either-side-of-the-median-line-its-posterior-extiemity-has-a-deep-rounded-excavation-almostjuadrangular-in-shape-the-uropoda-are-longer-than-the-tnquotminal-abdomi-nal-segment-the-inner-branch-has-the-outer-post-lateral-angle-produced-in-an-acute-point-the-inner-angle-being-rounded-the-outer-branch-is-longer-than-the-inner-branch-and-terminates-in-an-acutely-pointed-extremity-the-m-RG80F7.jpg ". Bulletin - United States National Museum. Science. ISOPODS OF NORTH AMERICA. 307 or tcrminiil .sogment has the convex anterior portion surmounted with two very inconspicuously small tubercles, one on either side of the median line. Its posterior exti'emity has a deep rounded excavation, almost(juadrangular in shape. The uropoda are longer than the t(n"minal abdomi- nal segment. The inner branch has the outer post-lateral angle produced in an acute point, the inner angle being rounded. The outer branch is longer than the inner branch, and terminates in an acutely pointed extremity. The m Stock Photo")
RMRG80F7–. Bulletin - United States National Museum. Science. ISOPODS OF NORTH AMERICA. 307 or tcrminiil .sogment has the convex anterior portion surmounted with two very inconspicuously small tubercles, one on either side of the median line. Its posterior exti'emity has a deep rounded excavation, almost(juadrangular in shape. The uropoda are longer than the t(n"minal abdomi- nal segment. The inner branch has the outer post-lateral angle produced in an acute point, the inner angle being rounded. The outer branch is longer than the inner branch, and terminates in an acutely pointed extremity. The m
RMRG8665–. Bulletin - United States National Museum. Science. ISOPODS OF NORTH AMERICA. 31 and near the distal end with a hirger process; the dactylus is more than half the length of the propodus and is strongly curv^ed. The six following pairs of legs are small and similar in shape, the dactylus in the second pair being only about twice as long as in any of the other five pairs. The dactylus in the last three pairs is more curved than in the three preceding pairs. In the female the first pair of antennjie are not elongated; the second and third articles are subequal and each is about half as long as t
RMRMGX2F–. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum. Natural history. 4:24 Annals of the South African Museum. pods and Isopods collected from seaweed (Prof. T. A. Stephenson, 1936, 2 ovig. ??, 2 juv.); East London (Prof. T. A. Stephenson, 1937, 1 ovig. $).. a. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. South African Museum. Cape Town : The Museum
RMRHK11C–. The biology of marine animals. Marine animals; Physiology, Comparative. 516 THE BIOLOGY OF MARINE ANIMALS they were produced and secreted in an endocrine organ, the sinus gland (Fig. 12.7(a)). This gland is usually located in the eye-stalk of malacostraca, but in some forms (isopods, anomuran Upogebia, etc.) the sinus gland lies near the brain. The gland is richly innervated and contains numerous secretory inclusions. It is now established that the sinus gland belongs to the category of neurosecretory organs. Secretory cells in various parts of the central nervous. Fig. 12.7. (a). Location o
![. Bulletin - United States National Museum. Science. ISOPODS OF NORTH AMERICA. 591 " Body slightly granulated, very convex, and narrowed backward, the side parts of the pereion (segments 2-7) and of the [)k>on tending downward. Cephalon: prosepistonia with a sliield-like triangular convexity; the prosepistonia is continuous with the forehead in the middle and separated from it on both sides by a transverse, incomplete, preocular cut. P]yes moderate; ocelli about 12. Antennie short; Hagellum small, first joint four times shorter than the second. Pereion: first segment with tlie antero-m Stock Photo](https://c8.alamy.com/comp/RG7NJD/bulletin-united-states-national-museum-science-isopods-of-north-america-591-quot-body-slightly-granulated-very-convex-and-narrowed-backward-the-side-parts-of-the-pereion-segments-2-7-and-of-the-kgton-tending-downward-cephalon-prosepistonia-with-a-sliield-like-triangular-convexity-the-prosepistonia-is-continuous-with-the-forehead-in-the-middle-and-separated-from-it-on-both-sides-by-a-transverse-incomplete-preocular-cut-p-yes-moderate-ocelli-about-12-antennie-short-hagellum-small-first-joint-four-times-shorter-than-the-second-pereion-first-segment-with-tlie-antero-m-RG7NJD.jpg ". Bulletin - United States National Museum. Science. ISOPODS OF NORTH AMERICA. 591 " Body slightly granulated, very convex, and narrowed backward, the side parts of the pereion (segments 2-7) and of the [)k>on tending downward. Cephalon: prosepistonia with a sliield-like triangular convexity; the prosepistonia is continuous with the forehead in the middle and separated from it on both sides by a transverse, incomplete, preocular cut. P]yes moderate; ocelli about 12. Antennie short; Hagellum small, first joint four times shorter than the second. Pereion: first segment with tlie antero-m Stock Photo")
RMRG7NJD–. Bulletin - United States National Museum. Science. ISOPODS OF NORTH AMERICA. 591 " Body slightly granulated, very convex, and narrowed backward, the side parts of the pereion (segments 2-7) and of the [)k>on tending downward. Cephalon: prosepistonia with a sliield-like triangular convexity; the prosepistonia is continuous with the forehead in the middle and separated from it on both sides by a transverse, incomplete, preocular cut. P]yes moderate; ocelli about 12. Antennie short; Hagellum small, first joint four times shorter than the second. Pereion: first segment with tlie antero-m
RMRG86HX–. Bulletin - United States National Museum. Science. ISOPODS OF NORTH AMEHlCA. 5 1. Genus PANCOLUS Richardson. Eyes present, distinct. First pair of antennae composed of three articles. Second pair of antenna? composed of five articles. First thoracic seg^ment permanently united with the head to form a cara- pace. The following- six segments are free and distinctly separated. The abdomen is composed of only three segments, two segments anterior to the terminal segment. There are but two pairs of well- developed pleopoda. The uropoda are single l)ranched and consist of a peduncle and a l)ranch
RMRJY540–. Atoll research bulletin. Coral reefs and islands; Marine biology; Marine sciences. 56 than ants, dominant invertebrate groups included Crustacea (including both Isopoda and Amphipoda), Blattodea, Dermaptera and Araneae (Fig. 3). In Hill plots, larger numbers of Crustacea were trapped. Only isopods were collected on the hill; amphipods were abundant but only trapped in plateau plots. Cockroaches (Blattodea) were also abundant in hill plots in both seasons. Plateau woodland sites were dominated by ants which made up 78.6% of the total individuals in pitfall assemblages. The most abundant speci
RMRG7WJ9–. Bulletin - United States National Museum. Science. ISOPODS OF NORTH AMERICA. 415 which is 4 mm. in length and has the posterior margin widely rounded. The terminal segment is 5 mm. wide at the base. The uropoda are half as long as the terminal abdominal segment. The peduncle is 1 mm. long. The outer branch is 1 mm. long. The inner branch is a very little longer than the outer branch. In the female the first ple- o})oda are attached close together as in the preceding species. The first pair of legs are strongly prehensile and have the propodus greatl}' dilated and the inferior margin armed wi
RMRG7YPA–. Bulletin - United States National Museum. Science. ISOPODS OF NORTH AMERICA. 329 from the segments, are eoiispicuous from a dorsal view, and are pro- duced at the sides in processes which are rather bknit at their extremities. The first two seo-nieiits of the abdomen are short. The t(M-niinal segment is long and pi'oduced to an extremit}'^ which has a V-shaped excavation. The length of the terminal segment is a little less than one- fourth that of the entire bod}', being 8 mm. long. Near the bas(^ is a transverse depression marked on either side by a blunt expansion of the lateral margin, pr
RMRHK8MD–. A biology of Crustacea. Crustacea. DISTRIBUTION 127 amphipods and Tanaidacea are quite well represented. The isopods in particular seem to have a number of species confined to this region; Macrostylis galatheae is the deepest recorded species, being found at a depth of 9,790 metres in the Philippine Trench. The only crustacean known from deeper water is an unidentified amphipod from 10,190 metres.1 Decapods have not been found in the hadal region, but some ostracods, a barnacle, mysids and a cumacean have been dredged up from the various trenches of the Pacific.. Fig. 57. Thaumastocheles zal
RMRG5Y4M–. Bulletin - United States National Museum. Science. ISOPODS OF NORTH AMERICA. 405 .six more or less broken l)lack lines. The lines on the sides are more distinet than those above. Head sub(iuadrat(>, partiall}^ iniuiersed in the lirst thoracic seg-ment and rounded on the posterior niarj>-in; sides parallel, anterior niaro-in. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. United States National Museum; Smithsonian I
![. Bulletin - United States National Museum. Science. ISOPODS OF NORTH AMERICA. 185. and both are pointed at the pot^terior extremity. The inner branch is ver}" slig-htl}" excavate on the exterior margin about 1 mm. from the extremity. Both branches are denticulate and furnished with spines. The first three pairs of leofs are prehensile, the last four pairs and)ulatory. All the legs are very slender and free from spines. JEGA SYMMETRICA Richardson. jEga symmetrica Rr'hakdsox, Bull. V. S. Fish ('Omiii., XXIV, 1905, pp. 211-212. Localities.—Vicinity of Nahii Bay, Behm Canal, southeast A Stock Photo](https://c8.alamy.com/comp/RG83G9/bulletin-united-states-national-museum-science-isopods-of-north-america-185-and-both-are-pointed-at-the-potterior-extremity-the-inner-branch-is-verquot-slig-htlquot-excavate-on-the-exterior-margin-about-1-mm-from-the-extremity-both-branches-are-denticulate-and-furnished-with-spines-the-first-three-pairs-of-leofs-are-prehensile-the-last-four-pairs-andulatory-all-the-legs-are-very-slender-and-free-from-spines-jega-symmetrica-richardson-jega-symmetrica-rrhakdsox-bull-v-s-fish-omiii-xxiv-1905-pp-211-212-localitiesvicinity-of-nahii-bay-behm-canal-southeast-a-RG83G9.jpg ". Bulletin - United States National Museum. Science. ISOPODS OF NORTH AMERICA. 185. and both are pointed at the pot^terior extremity. The inner branch is ver}" slig-htl}" excavate on the exterior margin about 1 mm. from the extremity. Both branches are denticulate and furnished with spines. The first three pairs of leofs are prehensile, the last four pairs and)ulatory. All the legs are very slender and free from spines. JEGA SYMMETRICA Richardson. jEga symmetrica Rr'hakdsox, Bull. V. S. Fish ('Omiii., XXIV, 1905, pp. 211-212. Localities.—Vicinity of Nahii Bay, Behm Canal, southeast A Stock Photo")
RMRG83G9–. Bulletin - United States National Museum. Science. ISOPODS OF NORTH AMERICA. 185. and both are pointed at the pot^terior extremity. The inner branch is ver}" slig-htl}" excavate on the exterior margin about 1 mm. from the extremity. Both branches are denticulate and furnished with spines. The first three pairs of leofs are prehensile, the last four pairs and)ulatory. All the legs are very slender and free from spines. JEGA SYMMETRICA Richardson. jEga symmetrica Rr'hakdsox, Bull. V. S. Fish ('Omiii., XXIV, 1905, pp. 211-212. Localities.—Vicinity of Nahii Bay, Behm Canal, southeast A
RMRMP5J6–. The Annals and magazine of natural history; zoology, botany, and geology. Natural history; Zoology; Botany; Geology. 184 Miss H. Ricliardson on the Isopods of the three new species agree with the generic characters of Giliccea except in the presence of the spine, we consider them for the present new and undescribed species of Giliccea. 31. CiNcaa cordata, sp. n. Body attenuated in front; colour a faint yellow, profusely marked with a delicate pink tint. Head with the anterior margin thickened, and slightly produced in front. Prominent median point triangularly Fig. 16.. Please note that thes
RMRPXNTF–. Alaska. Natural history -- Alaska; Scientific expeditions; Alaska. ISOPODS 215 lateral parts, which are not distinctly separated from the dorsal parts of the segments, are drawn out in acute processes in the first three segments. Those of the following segments are more nearly regular in outline. The abdomen is somewhat broader than the thorax, although this expansion of the abdomen does not show in a dorsal view. The first segment is about equal in length to the last thoracic segment, and is marked on either side by two suture lines indicative of coalesced segments. The ter- minal segment i
![. Bulletin - United States National Museum. Science. ISOPODS OF NORTH AMP:R10A. 511 83. Genus LEIDYA Cornalia and Panceri. Abdomen distinctly sojrmontod. PUninil lumelliv or lateral parts of the tirst five segments of the abdomen lanceolate, rtnely fringed. Legs of female terminate in a short, blunt claw. Exopods present and nearly etiiial on all seven paii's of legs. The pleopods are '' lanceolate and fringed." Male has the abdomen distincth" segmented. There are five pairs of simple rudimentary pleopods. Uropoda simple, in the form of two long appendages attached to the sixth al)do Stock Photo](https://c8.alamy.com/comp/RG7T3K/bulletin-united-states-national-museum-science-isopods-of-north-ampr10a-511-83-genus-leidya-cornalia-and-panceri-abdomen-distinctly-sojrmontod-puninil-lumelliv-or-lateral-parts-of-the-tirst-five-segments-of-the-abdomen-lanceolate-rtnely-fringed-legs-of-female-terminate-in-a-short-blunt-claw-exopods-present-and-nearly-etiiial-on-all-seven-paiis-of-legs-the-pleopods-are-lanceolate-and-fringedquot-male-has-the-abdomen-distincthquot-segmented-there-are-five-pairs-of-simple-rudimentary-pleopods-uropoda-simple-in-the-form-of-two-long-appendages-attached-to-the-sixth-aldo-RG7T3K.jpg ". Bulletin - United States National Museum. Science. ISOPODS OF NORTH AMP:R10A. 511 83. Genus LEIDYA Cornalia and Panceri. Abdomen distinctly sojrmontod. PUninil lumelliv or lateral parts of the tirst five segments of the abdomen lanceolate, rtnely fringed. Legs of female terminate in a short, blunt claw. Exopods present and nearly etiiial on all seven paii's of legs. The pleopods are '' lanceolate and fringed." Male has the abdomen distincth" segmented. There are five pairs of simple rudimentary pleopods. Uropoda simple, in the form of two long appendages attached to the sixth al)do Stock Photo")
RMRG7T3K–. Bulletin - United States National Museum. Science. ISOPODS OF NORTH AMP:R10A. 511 83. Genus LEIDYA Cornalia and Panceri. Abdomen distinctly sojrmontod. PUninil lumelliv or lateral parts of the tirst five segments of the abdomen lanceolate, rtnely fringed. Legs of female terminate in a short, blunt claw. Exopods present and nearly etiiial on all seven paii's of legs. The pleopods are '' lanceolate and fringed." Male has the abdomen distincth" segmented. There are five pairs of simple rudimentary pleopods. Uropoda simple, in the form of two long appendages attached to the sixth al)do
RMRG8686–. Bulletin - United States National Museum. Science. ISOPODS OF NORTH AMERICA. 27. Fig. 27.—Leptochelia SAViGNYi (After Harger). Female. X 20. Harg'er agroos with tlic uuilc of L. si(lu greatl}^ elon- gated. The basal article is very long and narrow, and is about equal to the length of the head. The second article is a little more than one-third as long- as the basal article. The third is one-half as long as the second. The flagellum is composed of seven or eight articles. The second pair of antennte are short, and do not reach the extremitv of the basal article of the tirst pair of antennte.
RMRG7X92–. Bulletin - United States National Museum. Science. ISOPODS OF NORTH AMERICA. 389. Fig. 430.—Syni- dotea nodu- LOSA. MAXIL- LIPED. X 33. about twice as long- as the second. The lirst antenna extend to the end of the fourth article of the peduncle of the second pair of antennae. The first two articles of the second pair of anteniiii? are short and sub- equal; the third and fourth are hubequal, and each is a))out twice as long as either of the two preceding articles; the fifth is one and a half times longer than the fourth. The fiagellum is composed of six articles. The second antennae extend t
RMRHK9PR–. A biology of Crustacea. Crustacea. 14 A BIOLOGY OF CRUSTACEA The presence, in the adult female, of a hrood pouch under the thorax is the hall-mark of the Peracarida, various members of which are shown in fig. 14. A well-developed carapace is present in the Mysidacea, and a less well-developed one in the Cumacea, Tanaidacea and Spelaeogriphacea. In the last group the carapace only covers the first thoracic segment; in the tanaids it is joined to the first two thoracic segments, while in the Cumacea it is joined to the first three or four segments of the thorax. The isopods and amphipods do no
RMRG815K–. Bulletin - United States National Museum. Science. ISOPODS OF NORTH AMERICA. 277. FiG.288.—Tecticeps alascensis. o, Mandible. /), Mandibular appendage, x 5§. c, Max- ILLIPED. X 20^. broad plate at the side of the .sefj-ment. The epiniera of all the sej{- nieiits are about twice as broad as long, with the exception of those of the fifth segment, which are nearly square and very conspicuous. The first segment of the abdomen has three suture lines, and its pos- terior margin projects down in two small triangular processes, one on either side, over the terminal seg- ment. The terminal segment is
RMRG7RGT–. Bulletin - United States National Museum. Science. ISOPODS OF NORTH AMERICA. 547 and Pribilof Islands, Alaska, on Nectocrangon lav; Arctic Ocean, on Nectocrang(m lar; Popoff Straits, on Nectocrangon cnixxa; between Bird and Najifai Islands, on Nectocrangon alascenats. List of Crangonidie on which Ai'geia pugette7isi.s is found parasitic: Nectocrangon ovifer Rath bun. Nectocrangon lar (Owen). Nectocrangon alascensis Kingsley. Nectocrangon crassa Rathbun. Nectocrangon dentata Rathbun. Crago nigromaculata (Lockington) Crago franciscorum angiistimana Imn). (Rath- Crago dalli (Rathbun). Crago com
![. Nature-study; a manual for teachers and students. Nature study. i84 NATURE-STUDY and crickets are closely related, and. similarly, the bees, wasps, and ants. They should be able to tell a bug from a beetle, a butterfly from a moth Typei of Insects The meaning of the word Insect is frequently wrongly stretched so as to include creatures that are not really in-. Fig. 44. Young and Old Locust. sects. Thus spiders, isopods, and centipedes are called "insects," and even so very different an animal as the coral polyp is called by this name. "What is an insect? This is best answered Stock Photo](https://c8.alamy.com/comp/RE54NP/nature-study-a-manual-for-teachers-and-students-nature-study-i84-nature-study-and-crickets-are-closely-related-and-similarly-the-bees-wasps-and-ants-they-should-be-able-to-tell-a-bug-from-a-beetle-a-butterfly-from-a-moth-typei-of-insects-the-meaning-of-the-word-insect-is-frequently-wrongly-stretched-so-as-to-include-creatures-that-are-not-really-in-fig-44-young-and-old-locust-sects-thus-spiders-isopods-and-centipedes-are-called-quotinsectsquot-and-even-so-very-different-an-animal-as-the-coral-polyp-is-called-by-this-name-quotwhat-is-an-insect-this-is-best-answered-RE54NP.jpg ". Nature-study; a manual for teachers and students. Nature study. i84 NATURE-STUDY and crickets are closely related, and. similarly, the bees, wasps, and ants. They should be able to tell a bug from a beetle, a butterfly from a moth Typei of Insects The meaning of the word Insect is frequently wrongly stretched so as to include creatures that are not really in-. Fig. 44. Young and Old Locust. sects. Thus spiders, isopods, and centipedes are called "insects," and even so very different an animal as the coral polyp is called by this name. "What is an insect? This is best answered Stock Photo")
RMRE54NP–. Nature-study; a manual for teachers and students. Nature study. i84 NATURE-STUDY and crickets are closely related, and. similarly, the bees, wasps, and ants. They should be able to tell a bug from a beetle, a butterfly from a moth Typei of Insects The meaning of the word Insect is frequently wrongly stretched so as to include creatures that are not really in-. Fig. 44. Young and Old Locust. sects. Thus spiders, isopods, and centipedes are called "insects," and even so very different an animal as the coral polyp is called by this name. "What is an insect? This is best answered
RMRG8119–. Bulletin - United States National Museum. Science. ISOPODS OF NORTH AMERICA. 289 ^e^ articles. The tirst antenna' extend to the posterior margin of the head. The second antennjs have the first two articles very short and eqnal in length; the thii-d and fourth are al)out equal in length and each is twice as long- as the second; the fifth article is one and a half times longer than the fourth. The flagellum is composed of nine articles. The second anteniue extend almost to the posterior margin of tiie tirst thoracic segment. The maxilliped has a palp of five articles. The niaiidi))le has a pal
RMRMP5PA–. The Annals and magazine of natural history; zoology, botany, and geology. Natural history; Zoology; Botany; Geology. 176 Miss H. Richardson on the Isopods of the tudinal ridges on the segment, one in the median line and one on either side of it. The uropoda are short, not reaching the extremity of the abdomen, and reguUirly rounded. The legs are slender ; the first two pairs are covered with long hairs and extend in an anterior direction, the other five pairs extend in a posterior direction. The type and only specimen was collected by Mr. Heath at Monterey Bay, California, at the surface. No
RMRN5RCJ–. Animal Ecology. Animal ecology. The respiratory equipment of pond-inhabiting animals permits them not only to live in habitats with lower oxygen tensions but also to survive longer at high water temperatures. Often, these animals dis- play relatively low rates of general body metabolism and oxygen requirement. Such relations between riffle and pond animals have been observed for may- fly naiads, caddisfly larvae, isopods, crayfish, and fishes (Allee 1912-13, Wells, 1918, Fox et al. 1935. Clausen 1936, Whitney 1939, Bovbjerg 1952), and to some extent for limpet snails (Berg 1951). RESPONSES T
RMRG5YCT–. Bulletin - United States National Museum. Science. ISOPODS OF NORTH AMERICA. 301 Body narrow, linear, rtliforni, at)()ut four times lonj^er than wide, 4 mm.: IT mm.; leiitli of abdomen about one-third that of entire length of l)ody, G nun.: IT nun. Head wider than long, with anterior margin .slightly excavate. Anterior portion of head hut slightly wider than posterior portion.. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original wor
![. Bulletin - United States National Museum. Science. ISOPODS OF NORTH AMERICA. 223 All of the segnu'iits of tho atRloincn uve distinct. The .sixth or tcnninal seo-ment is about as broad as long, 4 mm.: 4 mm. The seg- ment is somewhat quadrate, with the post- lateral angles obtusely rounded, and the pos- terior mai'gin p]-oduced in a small, triangular median point. The -uropoda arc longer than the terminal abdominal segment. The outer branch is longer than the inner branch, 3 nun.: 4 mm. Both branches are produced to narrow, acute extremities, the outer branch being also somewhat narrower at th Stock Photo](https://c8.alamy.com/comp/RG828P/bulletin-united-states-national-museum-science-isopods-of-north-america-223-all-of-the-segnuiits-of-tho-atrloincn-uve-distinct-the-sixth-or-tcnninal-seo-ment-is-about-as-broad-as-long-4-mm-4-mm-the-seg-ment-is-somewhat-quadrate-with-the-post-lateral-angles-obtusely-rounded-and-the-pos-terior-maigin-p-oduced-in-a-small-triangular-median-point-the-uropoda-arc-longer-than-the-terminal-abdominal-segment-the-outer-branch-is-longer-than-the-inner-branch-3-nun-4-mm-both-branches-are-produced-to-narrow-acute-extremities-the-outer-branch-being-also-somewhat-narrower-at-th-RG828P.jpg ". Bulletin - United States National Museum. Science. ISOPODS OF NORTH AMERICA. 223 All of the segnu'iits of tho atRloincn uve distinct. The .sixth or tcnninal seo-ment is about as broad as long, 4 mm.: 4 mm. The seg- ment is somewhat quadrate, with the post- lateral angles obtusely rounded, and the pos- terior mai'gin p]-oduced in a small, triangular median point. The -uropoda arc longer than the terminal abdominal segment. The outer branch is longer than the inner branch, 3 nun.: 4 mm. Both branches are produced to narrow, acute extremities, the outer branch being also somewhat narrower at th Stock Photo")
RMRG828P–. Bulletin - United States National Museum. Science. ISOPODS OF NORTH AMERICA. 223 All of the segnu'iits of tho atRloincn uve distinct. The .sixth or tcnninal seo-ment is about as broad as long, 4 mm.: 4 mm. The seg- ment is somewhat quadrate, with the post- lateral angles obtusely rounded, and the pos- terior mai'gin p]-oduced in a small, triangular median point. The -uropoda arc longer than the terminal abdominal segment. The outer branch is longer than the inner branch, 3 nun.: 4 mm. Both branches are produced to narrow, acute extremities, the outer branch being also somewhat narrower at th
RMRE0A87–. Zoology for high schools and colleges. Zoology. 286 ZOOLOGY. and Europe, which we have called Syncarida, and which have antennae and tails like shrimps, but the body. Pig. Zi9.—Gamp8(myx JlmbHatus ot European coal meaenres, Hi tunes natnral tize. and limbs like Amphipods. In the Isopods the body is flat- tened and the head rather broad. Fig. 251 is a dorsal view of Serolis Gau- dichaudi Audouin and Edwards, with the two pairs of antennae and pointed sides of each thoracic segment, dissected to show the nervous system, the two pairs of antennal nerves; the optic nerves {op) sent to the compou
![. The Annals and magazine of natural history; zoology, botany, and geology. Natural history; Zoology; Botany; Geology. 166 Miss H. Richardson on the Isopods of the Head with a small median point. Eyes large, situated but a little distance apart. First pair of antennae, with a flagel- lum of" about nine articles, extend to the antero-lateral angle of the first thoracic segment. Second pair of antennae broken in specimen. Fio-. 4.. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these i Stock Photo](https://c8.alamy.com/comp/RMP5WE/the-annals-and-magazine-of-natural-history-zoology-botany-and-geology-natural-history-zoology-botany-geology-166-miss-h-richardson-on-the-isopods-of-the-head-with-a-small-median-point-eyes-large-situated-but-a-little-distance-apart-first-pair-of-antennae-with-a-flagel-lum-ofquot-about-nine-articles-extend-to-the-antero-lateral-angle-of-the-first-thoracic-segment-second-pair-of-antennae-broken-in-specimen-fio-4-please-note-that-these-images-are-extracted-from-scanned-page-images-that-may-have-been-digitally-enhanced-for-readability-coloration-and-appearance-of-these-i-RMP5WE.jpg ". The Annals and magazine of natural history; zoology, botany, and geology. Natural history; Zoology; Botany; Geology. 166 Miss H. Richardson on the Isopods of the Head with a small median point. Eyes large, situated but a little distance apart. First pair of antennae, with a flagel- lum of" about nine articles, extend to the antero-lateral angle of the first thoracic segment. Second pair of antennae broken in specimen. Fio-. 4.. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these i Stock Photo")
RMRMP5WE–. The Annals and magazine of natural history; zoology, botany, and geology. Natural history; Zoology; Botany; Geology. 166 Miss H. Richardson on the Isopods of the Head with a small median point. Eyes large, situated but a little distance apart. First pair of antennae, with a flagel- lum of" about nine articles, extend to the antero-lateral angle of the first thoracic segment. Second pair of antennae broken in specimen. Fio-. 4.. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these i
RMRPXPC8–. Alaska ... Natural history; Scientific expeditions. ISOPODS 215 lateral parts, which are not distinctly separated from the dorsal parts of the segments, are drawn out in acute processes in the first three segments. Those of the following segments are more nearly regular in outline. The abdomen is somewhat broader than the thorax, although this expansion of the abdomen does not show in a dorsal view. The first segment is about equal in length to the last thoracic segment, and is marked on either side by two suture lines indicative of coalesced segments. The ter- minal segment is entire, and n
RMRG7XM1–. Bulletin - United States National Museum. Science. ISOPODS OF NORTH AMERICA. 379 expansion, so that the}' secni more dorsal in position. The tirst anten- nffi have the basal article not enlarg'ed; the second is about equal in length to the tirst; the third and fourth are sube(jual, and each is al)Out one and a half times lonoer than the third. The tirst pair of anteniue extend to the end of the fourth peduncular article of the second pair of antenna'. The basal article of the second pair of antennie is almost in- conspicuous from a dorsal view; the second article is short; the third, fourth,
RMRG8179–. Bulletin - United States National Museum. Science. ISOPODS OF NOETH AMERICA. 273 This o-enus differs from Cassidina^^ Milne Edwards and Cassidinella Whitelco-ge/Mn nothavino- the palp of the maxillipeds with the second, third, and fourth articles produced into lobes. ANALYTICAL KEY TO THE SPECIES OF THE GENUS CASSIDISCA. a. Terminal segment of abdomen smooth. Outer branch of uropoda about one- fourth as long as inner branch. Apex of abdomen truncate. Cassidinca lanifronn (Kichard.son) a'. Terminal segment of abdomen with three low transverse elevations as the base. Outer branch of uropoda mo
RMRG86C3–. Bulletin - United States National Museum. Science. ISOPODS OF ISTORTH AMERICA. 15 The first segment of the thorax is united with the head to form a carapace. The second or first free seg-ment is the shortest of all; the third and fourth or second and third free segments are nearly equal in length, the third being perhaps a little longer; the fifth and sixth or fourth and fifth free segments are su))cqual and arc the longest; the sixth or seventh free segment is about equal' in length to the third free segment. The abdomen is composed of six segments. The first three are sub- equal in length
RMRD9K05–. Zoology : for students and general readers . Zoology. Fig. 254.— Gampsmyx fimlniatus of European coal meaenres, 214 times natural eize. and limbs like Amphipods. In the Isopods the body is flat- tened and the head rather broad. Fig. 256 is a dorsal view of Se7-oUs Gau- dichaudi Audouin and Edwards, with the two pairs of antenna? and pointed sides of each thoracic segment, dissected to show the nervous system, the two pairs of antennal nerves; the optic nerves {op) sent to the compound eyes. Fig. 257 represents a trans- verse section of the body, showing the mode of insertion of the legs, and
RMRMJJWE–. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum. Natural history. 452 ANNALS OF THE SOUTH AFRICAN MUSEUM a. Fig. 30. Tylos capensis. Histogram showing size grouping of males and females. isopods are up to 400 mm beneath the sand. Even probing in the sand is unlikely to expose any animals. It is perhaps possible that genets (Genetta sp.) and pole- cats {Ictonyx sp.) from the surrounding bush could prey on the animals at night. This is, however, pure speculation, no proof having been found. Perhaps this species does not have any predators at all. COMPETITORS Apart fr
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