Nereis Black & White Stock Photos
RF2BTGRMX–A diagram of the nephridium of Nereis, that possess setae and parapodia for locomotion. They may have two types of setae, which are found on the parap
RMGK46HY–46975 1-Nereis cultrifera (Grub), adulte-- 2, individu jeune -- 3, forme heteronereide, femelle de la meme espece -- 4, forme
RM2AJ07C2–Outlines of zoology . notopodium. Each of these is bilobed, bears a tactileprocess or cirrus, and is fringed with firm bristles or setse. Within thesubstance of each lobe is embedded a stout needle-shaped aciculum, GENERAL SURVEY OF THE CLASS CH^TOPODA. 231 which functions as an internal skeleton, both by giving support and byserving as an attachment for muscles. With the notopodium, further,true gills containing prolongations of the body cavity are often associ-ated. Such typical parapodia occur especially in the active free-livingforms like Nereis and its allies, but in the order in general
RMPG3YT3–. A manual of zoology. PHYLUM CHORDATA 343 zs IB with the myomeres), indicates that the body, like that of Nereis or an Arthropod, is metamerically segmented. In the lizard and rabbit the metamerism of the muscular sys- tem, though distinguishable at an early stage, becomes lost in the adult, and the muscles take on a much more compli- cated arrangement. On the jaws are a series of teeth, the function of which is to seize the food, and in the rabbit cut it into fragments, and crush it into yet smaller particles, in order to prepare it for the process of digestion. In the dogfish the teeth are
RM2AFJD2K–. The physiology of the Invertebrata. ABCFig. 62.—Nervous Systems of Polych^;ta. A = Polynbe squamata. B = SabelUi Jlahellata. C = Nereis a = cerebral ganglia. b = oesophageal commissures.c = longitudinal commissures of ventral ganglia, Lumhricus are seen to contain a large number of nerve-cells along with the nerve-fibres. This is a characteristicfeature of Lumhricus and Peripatus. In Hirudo the nerve- PHYSIOLOGY OF THE INVERTEBRATA. 323 cells are confined to the ganglia; in this respect the nervesof the leech are like those of Astacus and the spinal cord ofthe Vertebrata. The nervous system
RMPG4097–. A manual of zoology. 196 MANUAL OF ZOOLOGY (Fig. in) consists of a darkly pigmented cup, the retina {re), with a small rounded aperture, the pupil, and enclosing a mass of gelatinous matter, the lens (/).. Fig. III. — Section through an eye of Nereis, co, cornea; cu, cuticle; /, lens; r, layer of rods; re, retina. (After Andrews.) The organs which are supposed to perform the function of excretion are a series of metamerically arranged pairs of internally ciliated tubes, the segmental organs or nephridia (Figs. 109 and no, nepli) occurring in all the segments of the body. Each of these has an
RMRE081G–. A text-book of invertebrate morphology. Invertebrates. FiQ. 100.—Antbriob End of Nereis virena. c = cirrus. p = parapodium. pi = palp. t = tentacle.. 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.. McMurrich, J. Playfair (James Playfair), 1859-1939. New York, H. Holt and Company
RMPG4090–. A manual of zoology. 19S MANUAL OF ZOOLOGY sect. the exterior, in the case of the sperms probably through the nephridia ; in the case of the ova, which are much too large to pass out in this way, probably through apertures tempo- rarily formed by rupture of the body-wall; and impregnation takes place by contact between the two sets of elements while floating freely in the sea-water.. Fig. -Serpulae with their tubes. (After Quatrefages.) Other annelides which may be collected along with Nereis on the sea-shore will be found to resemble it in the seg- mented character of the body, and the pres
RMRDJ38E–. Elements of zoology, to accompany the field and laboratory study of animals. Zoology. NEREIS V31. Fig. 191. — Tcenia solium, the human tapeworm. Entire specimen, about natural size. Cap, head. After Leuckart.. 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.. Davenport, Charles Benedict, 1866-1944; Davenport, Gertrude Anna Crotty, 1866- joint author. New York, Macmillan
RMPG4084–. A manual of zoology. PHYLUM ANNULATA pelagic larva, the Trochosphere (Fig. 114), provided with one or several circlets of cilia. When a common earthworm is compared with Nereis, certain resemblances are at once discernible. The earth- worm (Fig. 115) has the same elongated cylindrical body, divided by ring-like grooves into a large number of seg- ments or metameres. But the well-developed head-region is absent, as are the eyes, palpi, and tentacles, and the parapoda are not present, nor the dorsal and ventral cirri. Setae, however, are present (Fig. 116), though so short as to be distinguish
RMRDHR6T–. A manual of elementary zoology . Zoology. ANNELIDA . THE EARTHWORM, NEREIS 223 and prolonged at their inner ends into fibres, which run in the nervous system (Fig. 140). These are sense rgans, CQ^ an(j jn ^ forepar); 0f the body some of them are collected into groups, which are rudimentary sense organs. Experiment shows that the worms are sensitive to light and to vibrations of the ground and can smell, but gives no evidence of a sense of hearing. The excretory or- gans of Excretion. ° ,, an earth- worm, like those of the frog, consist of tubes whose walls are excretory and richly supplied w
RMPG0KK9–. Zoology : for students and general readers . Zoology. 236 ZOOLOGY. feet are jointed, thus anticipating the jointed appendages of the Crustacea and Insects. Tlie Annelides are divided into two suborders. The first snboi-dev, OUcfochmta, comprises Lumbricics, Nais, etc., while the second suborder, Chmtopoda, embraces Syllis, Autolycus, Nereis, Polydora, Aphrodite, and Polytwe, which are free- swimming, while the tubiculons worms which respire by spe-. FiG. 158. Fig. 158,— Cistenides Gouldii^ and its tnbe.—After Verrill. Fig. 159,—.E'wc/itme elegans, enlarged,—Alter Verrill. FiQ, 159. cial bran
![. Zoölogy [microform] : descriptive and practical. Zoology; Zoologie. Annulata. 99 kinds of parts or organs that the earthworm possesses; it has simply lost a part of the mtcstme, nerve cord, blo*)d tuUs. elc, but not ail of any one set of organs. Color of the Earthworm. - The color of the earthworm is largely due to the color of the blood and to the matter contained within the diges- t.ve tube. But besides this, the dorsal surface is darker than the ven- tral, as is the case with most animals. The Sandworm. —One of the commonest of the sea worms (Nereis) is known as the sandworm or clam worm. Stock Photo](https://c8.alamy.com/comp/RENDCP/zology-microform-descriptive-and-practical-zoology-zoologie-annulata-99-kinds-of-parts-or-organs-that-the-earthworm-possesses-it-has-simply-lost-a-part-of-the-mtcstme-nerve-cord-blod-tuus-elc-but-not-ail-of-any-one-set-of-organs-color-of-the-earthworm-the-color-of-the-earthworm-is-largely-due-to-the-color-of-the-blood-and-to-the-matter-contained-within-the-diges-tve-tube-but-besides-this-the-dorsal-surface-is-darker-than-the-ven-tral-as-is-the-case-with-most-animals-the-sandworm-one-of-the-commonest-of-the-sea-worms-nereis-is-known-as-the-sandworm-or-clam-worm-RENDCP.jpg ". Zoölogy [microform] : descriptive and practical. Zoology; Zoologie. Annulata. 99 kinds of parts or organs that the earthworm possesses; it has simply lost a part of the mtcstme, nerve cord, blo*)d tuUs. elc, but not ail of any one set of organs. Color of the Earthworm. - The color of the earthworm is largely due to the color of the blood and to the matter contained within the diges- t.ve tube. But besides this, the dorsal surface is darker than the ven- tral, as is the case with most animals. The Sandworm. —One of the commonest of the sea worms (Nereis) is known as the sandworm or clam worm. Stock Photo")
RMRENDCP–. Zoölogy [microform] : descriptive and practical. Zoology; Zoologie. Annulata. 99 kinds of parts or organs that the earthworm possesses; it has simply lost a part of the mtcstme, nerve cord, blo*)d tuUs. elc, but not ail of any one set of organs. Color of the Earthworm. - The color of the earthworm is largely due to the color of the blood and to the matter contained within the diges- t.ve tube. But besides this, the dorsal surface is darker than the ven- tral, as is the case with most animals. The Sandworm. —One of the commonest of the sea worms (Nereis) is known as the sandworm or clam worm.
RMPG0KKR–. Zoology : for students and general readers . Zoology. ANATOMY OF NEREIS VIRENS. 331 lands, bringing the subsoil to the surface and allowing the air to get to the roots of plants, they occasionally injure young seedling cabbage, lettuce, beets, etc., drawing them during the night into their holes, or uprooting them. The next and highest type of Annulata is the common sea-worm of our coast. Nereis virens Sars. It lives between tide-marks in holes in the mud, and can be readily obtained. The body, after the head, eyes, tentacles and bristle-bearing feet have been carefully studied, can be opene
![. Elements of zoology, to accompany the field and laboratory study of animals. Zoology. NEREIS 191 and structure. Such is the case with some of the round- worms. Some of these are thread-lili;e, live in springs or pools, and are regarded by the uninitiated as ani- mated horsehairs. Others are spindle-shaped, as, for example, the " vinegar eel " and the roundworms that are common in stagnant water. Others live in the food canal, as, for example, the stomach-worm (As'caris) of the horse and the pinworm of man. Others still penetrate into the muscles, and cause great pain and often deat Stock Photo](https://c8.alamy.com/comp/RDJ3AA/elements-of-zoology-to-accompany-the-field-and-laboratory-study-of-animals-zoology-nereis-191-and-structure-such-is-the-case-with-some-of-the-round-worms-some-of-these-are-thread-lilie-live-in-springs-or-pools-and-are-regarded-by-the-uninitiated-as-ani-mated-horsehairs-others-are-spindle-shaped-as-for-example-the-quot-vinegar-eel-quot-and-the-roundworms-that-are-common-in-stagnant-water-others-live-in-the-food-canal-as-for-example-the-stomach-worm-ascaris-of-the-horse-and-the-pinworm-of-man-others-still-penetrate-into-the-muscles-and-cause-great-pain-and-often-deat-RDJ3AA.jpg ". Elements of zoology, to accompany the field and laboratory study of animals. Zoology. NEREIS 191 and structure. Such is the case with some of the round- worms. Some of these are thread-lili;e, live in springs or pools, and are regarded by the uninitiated as ani- mated horsehairs. Others are spindle-shaped, as, for example, the " vinegar eel " and the roundworms that are common in stagnant water. Others live in the food canal, as, for example, the stomach-worm (As'caris) of the horse and the pinworm of man. Others still penetrate into the muscles, and cause great pain and often deat Stock Photo")
RMRDJ3AA–. Elements of zoology, to accompany the field and laboratory study of animals. Zoology. NEREIS 191 and structure. Such is the case with some of the round- worms. Some of these are thread-lili;e, live in springs or pools, and are regarded by the uninitiated as ani- mated horsehairs. Others are spindle-shaped, as, for example, the " vinegar eel " and the roundworms that are common in stagnant water. Others live in the food canal, as, for example, the stomach-worm (As'caris) of the horse and the pinworm of man. Others still penetrate into the muscles, and cause great pain and often deat
RMPG0KK4–. Zoology : for students and general readers . Zoology. SILURIAN WORM TRACKS. 337 especially on the coast of Brazil. The minute nautilus-like shells of Spirorbis live attached to the fronds of sea-weeds especially the different kinds of Fucus.. Fig. W.— Cirratulm grandis.—After Verrill. Many sea-worms are highly iihosphorescent,the light emit- ted being intensely green. The tracks of worms like the Nereis of to-day occur in the lower Silurian slates; their bristles, however, were spinulose, as in the larval worms. Thus the type, though highly specialized, has, unlike most sjDecialized groups,
RMRDJFE0–. A manual of zoology. PHYLUM CHORDATA 343 zs IB with the myomeres), indicates that the body, like that of Nereis or an Arthropod, is metamerically segmented. In the lizard and rabbit the metamerism of the muscular sys- tem, though distinguishable at an early stage, becomes lost in the adult, and the muscles take on a much more compli- cated arrangement. On the jaws are a series of teeth, the function of which is to seize the food, and in the rabbit cut it into fragments, and crush it into yet smaller particles, in order to prepare it for the process of digestion. In the dogfish the teeth are
RMPG409H–. A manual of zoology. . hni ^>nepk. e-T - Fig. 109.— Nereis dumerilii. Semi-diagrammatic view of the anterior portion of the body, with the dorsal body-wall removed, so as to show the alimentary canal, the septa, the blood-vessels and the nephridia; a portion of the intestine removed so as to show the ventral blood-vessel and nerve-cord which lie below, dors, vess, dorsal vessel; gl, oesophageal glands; ini, beginning of intestine; ne. co, nerve cord; neph. nephridia; ces, oesophagus; palp, palp; pa?-a, parapodia; perist, peristome; perist. tent, peristomial tentacles; //;, pharynx with
RMRE0FMM–. Zoology for high schools and colleges. Zoology. ANATOMY OF NEREIS VIRENS. 311 lands, bringing the subsoil to the surface and allowing the air to get to the roots of plants, they occasionally injure young seedling cabbage, lettuce, beets, etc., drawing them during the night into their holes, or uprooting them. The next and highest type of Annulata is the common sea-worm of our coast. Nereis virens Sars. It lives between tide-marks in holes in the mud, and can be readily obtained. The body, after the head, eyes, tentacles and bristle-bearing feet have been' carefully studied, can be opened alo
RMPG408W–. A manual of zoology. PHYLUM ANNULATA â 99 possess branchiaz, organs which are absent as such in Nereis, in the form of simple or branched vascular processes ar- ranged in pairs on the dorsal side of the parapodia, through- out the whole or a part of the length of the body, or (Fig. 113) confined to the head-end. All such marine worms belong to the sub-class Polyehseta of the Chsetopoda. Though many of them move about freely like Nereis, others live permanently in tubes of a membranous or shelly mate-. FlG. 114.âA, B, C, three stages in the development of the Trochosphere of Eupomatus, from t
RMRDHR7F–. A manual of elementary zoology . Zoology. ANNELIDA : THE EARTHWORM, NEREIS 219 consisting of unstriped fibres running around the body, and below this again lies a much thicker longitudinal layer of muscle, composed of similar fibres running along the body and placed in rows which stand at right angles to the surface, supported by connective tissue. Within the longitudinal muscle is the ccelomic epithelium, which is here a layer of pavement cells lining the body cavity. The alimentary canal is Out. straight. It be- gins with a short, wide, thin-walled mouth or buccal cavity in the first three
RMPG0KM5–. Zoology : for students and general readers . Zoology. 226 ZOOLOGY. The student, in familiarizing himself with the structure and mode of growth of the leech, the common earth-worm. Fig. 148.—Transverse section of a worm, of AmpWoxtis, and a higher -vertebrate contrasted, o, skin ; 6, dermal connective layer; c, muscles; d, segmental organ ; h, arterial, and i, venous blood-vessel; g^ intestine ; I, notochord.—After Haeckel. and the Nereis, will obtain a good idea of the essential char- acteristics of the entire class. Order 1. Hirudinea.—In the leech (Fig. 149), Hirudo medicinalis Linn., the
RMRDJ3AX–. Elements of zoology, to accompany the field and laboratory study of animals. Zoology. NEREIS 187 iud related with its carnivorous life are its powerful jaws and well- developed sense organs on the head. These consist of eyes, feelers, and tasting organs. From such forms as Nereis there has developed a long series of worms inhabiting the sand or constructing special tubes in which to live. At the end of the series there are includetl worms that live permanently in thin limj^ tubes and have lost the locomotor and sense organs of Nereis. We shall examine in order some of these different worms a
RMPG1DG7–. Heredity in relation to evolution and animal breeding, . Heredity. HEREDITY. Fig. 2. — Fertilization of the egg of Nereis. A. The sperm has entered the egg and is forming a minute nucleus at o*. The egg-nucleus is breaking up preparatory to the first maturation division. B. The egg-nucleus is undergoing the first maturation division. Notice the con- spicuous rod-like chromosomes separating into two groups. The sperm-nucleus (,J) is now larger and lies deeper in the egg. C. A small polar-cell has been formed above by the first maturation division of the egg. A second division is in progress a
RMRDJX63–. Text-book of embryology. Embryology. 156 INVERTEBRATA CHAP. and left daughters, and these begin to found the mesodermic bands, Wilson has recently pointed out, however (1898), that 4d is sufficiently reminiscent of its endodermic origin to contribute six to ten small cells to the formation of the intestinal wall. When the larva of Nereis is fully developed, i.e. when the alimen- tary canal has become functional, it is not only provided with a post- troohal worm-body but this body shows the rudiments of no less than three pairs of parapodia, and this seems to be a general feature amongst many
RMPFYMH7–. The birds of Australia. Birds. THE WHITE-FACED STOKM PETREL 51 Nest a slight hollow under rocks or other cover. One egg is laid; colour white, with some very small faint brownish spots on the larger end; it measures about 1.27 x .87 inch.. Yellow-webbed Storm Petrel: Oceanites oceanicus. Meyer. The Grey-backed Storm Petrel. Garrodia nereis. Southern Ocean. Greyish black, darkest on head, becoming greyer towards rump; wings black; median and tail coverts and tail have narrow edge of white; under surface white, sides streaked with grey; tail grey, tipped with black. Total length about 6.7 inch
RMRE0FM0–. Zoology for high schools and colleges. Zoology. '216 ZOOLOGY. feet are jointed, thus anticipating the jointed appendages of the Crustacea and Insects. The Annelides are divided into two suborders. The first suborder, Oligochmta, comprises Lumbricus, Nais, etc., while the second suborder, Chmtopoda, embraces Syllis, Autolytus, Nereis, Polydora, Aphrodite., and Polynoe, which are free- swimming, while the tubicolons worms which respire by spe-. FiG. J53. Fig. 152.âCisienides Gouldii, and if.s tube.âAfter â Verrill. Fig. 153 âEuchone elegans, enlarged.âAfter Verrill. cial branchiae, or gills, o
RMRDJ6XW–. A manual of zoology. 19S MANUAL OF ZOOLOGY sect. the exterior, in the case of the sperms probably through the nephridia ; in the case of the ova, which are much too large to pass out in this way, probably through apertures tempo- rarily formed by rupture of the body-wall; and impregnation takes place by contact between the two sets of elements while floating freely in the sea-water.. Fig. -Serpulae with their tubes. (After Quatrefages.) Other annelides which may be collected along with Nereis on the sea-shore will be found to resemble it in the seg- mented character of the body, and the pres
RMRDJ3X8–. A manual of elementary zoology . Zoology. ANNELIDA : THE EARTHWORM, NEREIS 231 earthworm the whole body consists of similar divisions arranged one after the other in a line or series. These divisions are the segments. Each contains a ring of the body-wall, with setae and openings, a separate portion of the ccelom, a section of the gut, a ganglion, nephridia, and blood vessels. A body so constructed is said to be metamerically segmented. Most of the segments resemble one another closely, but in the forepart of the body they show considerable differences in the reproductive, alimentary,. Fig.
RMRDJ6WB–. A manual of zoology. PHYLUM ANNULATA pelagic larva, the Trochosphere (Fig. 114), provided with one or several circlets of cilia. When a common earthworm is compared with Nereis, certain resemblances are at once discernible. The earth- worm (Fig. 115) has the same elongated cylindrical body, divided by ring-like grooves into a large number of seg- ments or metameres. But the well-developed head-region is absent, as are the eyes, palpi, and tentacles, and the parapoda are not present, nor the dorsal and ventral cirri. Setae, however, are present (Fig. 116), though so short as to be distinguish
RMRDJ6YG–. A manual of zoology. 196 MANUAL OF ZOOLOGY (Fig. in) consists of a darkly pigmented cup, the retina {re), with a small rounded aperture, the pupil, and enclosing a mass of gelatinous matter, the lens (/).. Fig. III. — Section through an eye of Nereis, co, cornea; cu, cuticle; /, lens; r, layer of rods; re, retina. (After Andrews.) The organs which are supposed to perform the function of excretion are a series of metamerically arranged pairs of internally ciliated tubes, the segmental organs or nephridia (Figs. 109 and no, nepli) occurring in all the segments of the body. Each of these has an
RMRDHPH1–. A manual of elementary zoology . Zoology. Plate XIV.—Members of the pelagic fauna, considerably magnified. The animals shown here belong to the plankton or drifting fauna, so called because its powers of swimming are insignificant compared with the strength of the currents of the sea. They derive their food from minute floating plants, and in turn serve to feed larger pelagic animals, such as the great jelly-fish, herrings, and whales. i, Noctiluca.) a large, phosphorescent flagellate ; 2, medusa of a hydroid ; 5, a worm related to Nereis; 6, a crustacean related to Cyclops; 8, the Arrow wor
![. A manual of elementary zoology . Zoology. CHAPTER XIV THE EARTHWORM, NEREIS, AND THE LEECH. ANNELIDA Almost everywhere in England earthworms are found. They live usually in the upper layers of the soil in burrows, which they make partly by boring with the pointed front ends of their bodies, partly by swallowing the earth in front and passing it out behind, in which case the earth which is passed out forms the well- known " worm casts." The sides of the burrow are lined with a slime secreted by unicellular glands in the skin, and if the opening be not protected by a worm cast it is Stock Photo](https://c8.alamy.com/comp/RDHR86/a-manual-of-elementary-zoology-zoology-chapter-xiv-the-earthworm-nereis-and-the-leech-annelida-almost-everywhere-in-england-earthworms-are-found-they-live-usually-in-the-upper-layers-of-the-soil-in-burrows-which-they-make-partly-by-boring-with-the-pointed-front-ends-of-their-bodies-partly-by-swallowing-the-earth-in-front-and-passing-it-out-behind-in-which-case-the-earth-which-is-passed-out-forms-the-well-known-quot-worm-castsquot-the-sides-of-the-burrow-are-lined-with-a-slime-secreted-by-unicellular-glands-in-the-skin-and-if-the-opening-be-not-protected-by-a-worm-cast-it-is-RDHR86.jpg ". A manual of elementary zoology . Zoology. CHAPTER XIV THE EARTHWORM, NEREIS, AND THE LEECH. ANNELIDA Almost everywhere in England earthworms are found. They live usually in the upper layers of the soil in burrows, which they make partly by boring with the pointed front ends of their bodies, partly by swallowing the earth in front and passing it out behind, in which case the earth which is passed out forms the well- known " worm casts." The sides of the burrow are lined with a slime secreted by unicellular glands in the skin, and if the opening be not protected by a worm cast it is Stock Photo")
RMRDHR86–. A manual of elementary zoology . Zoology. CHAPTER XIV THE EARTHWORM, NEREIS, AND THE LEECH. ANNELIDA Almost everywhere in England earthworms are found. They live usually in the upper layers of the soil in burrows, which they make partly by boring with the pointed front ends of their bodies, partly by swallowing the earth in front and passing it out behind, in which case the earth which is passed out forms the well- known " worm casts." The sides of the burrow are lined with a slime secreted by unicellular glands in the skin, and if the opening be not protected by a worm cast it is
![. A textbook of invertebrate morphology [microform]. Invertebrates; Morphology (Animals); Invertébrés; Morphologie (Animaux). FiG. 100.—Anterior End of Nereis virenB. e = cirrus. p = parapodium. P^ = P^^I^- Pig. 101.—Amp?iitrite ornata (after t = tentacle. Vbrrill). bonate of lime. Within these tubes the animals permanently reside, and in conformity with this mode of life numerous adaptations of structure are found. The head is usually pro- vided with a number of long cirri and the branchiae are for the most part confined to the head region. In some forms, such. Please note that these images a Stock Photo](https://c8.alamy.com/comp/RJ4P0D/a-textbook-of-invertebrate-morphology-microform-invertebrates-morphology-animals-invertbrs-morphologie-animaux-fig-100anterior-end-of-nereis-virenb-e-=-cirrus-p-=-parapodium-p-=-pi-pig-101ampiitrite-ornata-after-t-=-tentacle-vbrrill-bonate-of-lime-within-these-tubes-the-animals-permanently-reside-and-in-conformity-with-this-mode-of-life-numerous-adaptations-of-structure-are-found-the-head-is-usually-pro-vided-with-a-number-of-long-cirri-and-the-branchiae-are-for-the-most-part-confined-to-the-head-region-in-some-forms-such-please-note-that-these-images-a-RJ4P0D.jpg ". A textbook of invertebrate morphology [microform]. Invertebrates; Morphology (Animals); Invertébrés; Morphologie (Animaux). FiG. 100.—Anterior End of Nereis virenB. e = cirrus. p = parapodium. P^ = P^^I^- Pig. 101.—Amp?iitrite ornata (after t = tentacle. Vbrrill). bonate of lime. Within these tubes the animals permanently reside, and in conformity with this mode of life numerous adaptations of structure are found. The head is usually pro- vided with a number of long cirri and the branchiae are for the most part confined to the head region. In some forms, such. Please note that these images a Stock Photo")
RMRJ4P0D–. A textbook of invertebrate morphology [microform]. Invertebrates; Morphology (Animals); Invertébrés; Morphologie (Animaux). FiG. 100.—Anterior End of Nereis virenB. e = cirrus. p = parapodium. P^ = P^^I^- Pig. 101.—Amp?iitrite ornata (after t = tentacle. Vbrrill). bonate of lime. Within these tubes the animals permanently reside, and in conformity with this mode of life numerous adaptations of structure are found. The head is usually pro- vided with a number of long cirri and the branchiae are for the most part confined to the head region. In some forms, such. Please note that these images a
RMRDGG5A–. An introduction to zoology, with directions for practical work (invertebrates). XII CRUSTACEA 169 A curious well-known fact about the hermit crabs is their custom of living in partnership with certain other creatures ; e.g. a beautiful sea Bristle-worm {Nereis fumta) is very frequently to be found within the shell, whilst attached externally there may be one or more special sea anemones or a cluster of the little zoophyte Hydractinia. Though the crab is carnivorous, all these associated forms live peaceably together, the guests feeding off the discarded morsels of the crab's meal. Sessile-ey
RMRD9KBY–. Zoology : for students and general readers . Zoology. ANATOMY OF NEREIS VIRENS. 331 lands, bringing the subsoil to the surface and allowing the air to get to the roots of plants, they occasionally injure young seedling cabbage, lettuce, beets, etc., drawing them during the night into their holes, or uprooting them. The next and highest type of Annulata is the common sea-worm of our coast. Nereis virens Sars. It lives between tide-marks in holes in the mud, and can be readily obtained. The body, after the head, eyes, tentacles and bristle-bearing feet have been carefully studied, can be opene
![. Elements of zoology, to accompany the field and laboratory study of animals. Zoology. NEREIS 185 there. These animals of the quiet harbor are mostly weak and defenceless ; they seek chiefly to avoid their enemies by retreat- ing from them. Between the rocky promontories and the salt-marsh exist all possible gradations, and in each different habitat one will find a totally different fauna. In this chapter we shall consider an animal living in the bottoms of harbors, laiown as the sandworm (Ne'reis). It S^^";. Fig. 176.—An estuary with a salt-marsh m the distance where semiaquatic plants Stock Photo](https://c8.alamy.com/comp/RDJ3BX/elements-of-zoology-to-accompany-the-field-and-laboratory-study-of-animals-zoology-nereis-185-there-these-animals-of-the-quiet-harbor-are-mostly-weak-and-defenceless-they-seek-chiefly-to-avoid-their-enemies-by-retreat-ing-from-them-between-the-rocky-promontories-and-the-salt-marsh-exist-all-possible-gradations-and-in-each-different-habitat-one-will-find-a-totally-different-fauna-in-this-chapter-we-shall-consider-an-animal-living-in-the-bottoms-of-harbors-laiown-as-the-sandworm-nereis-it-squot-fig-176an-estuary-with-a-salt-marsh-m-the-distance-where-semiaquatic-plants-RDJ3BX.jpg ". Elements of zoology, to accompany the field and laboratory study of animals. Zoology. NEREIS 185 there. These animals of the quiet harbor are mostly weak and defenceless ; they seek chiefly to avoid their enemies by retreat- ing from them. Between the rocky promontories and the salt-marsh exist all possible gradations, and in each different habitat one will find a totally different fauna. In this chapter we shall consider an animal living in the bottoms of harbors, laiown as the sandworm (Ne'reis). It S^^";. Fig. 176.—An estuary with a salt-marsh m the distance where semiaquatic plants Stock Photo")
RMRDJ3BX–. Elements of zoology, to accompany the field and laboratory study of animals. Zoology. NEREIS 185 there. These animals of the quiet harbor are mostly weak and defenceless ; they seek chiefly to avoid their enemies by retreat- ing from them. Between the rocky promontories and the salt-marsh exist all possible gradations, and in each different habitat one will find a totally different fauna. In this chapter we shall consider an animal living in the bottoms of harbors, laiown as the sandworm (Ne'reis). It S^^";. Fig. 176.—An estuary with a salt-marsh m the distance where semiaquatic plants
RMRD9KBB–. Zoology : for students and general readers . Zoology. 236 ZOOLOGY. feet are jointed, thus anticipating the jointed appendages of the Crustacea and Insects. Tlie Annelides are divided into two suborders. The first snboi-dev, OUcfochmta, comprises Lumbricics, Nais, etc., while the second suborder, Chmtopoda, embraces Syllis, Autolycus, Nereis, Polydora, Aphrodite, and Polytwe, which are free- swimming, while the tubiculons worms which respire by spe-. FiG. 158. Fig. 158,— Cistenides Gouldii^ and its tnbe.—After Verrill. Fig. 159,—.E'wc/itme elegans, enlarged,—Alter Verrill. FiQ, 159. cial bran
RMRDJ3CJ–. Elements of zoology, to accompany the field and laboratory study of animals. Zoology. CHAPTER XIII NEREIS; A STUDY OF LIFE ON THE SEASHORE More than any other part of the earth the seashore has been the place of origin of the diverse tjiDes of animal life. The reason for this is not far to seek if it be granted that a diver- â ^ %ty^^'. ^: L^^ Fig. 1(3. â The rocky shore, worn smooth by the beating of the sea. sity of environment favors the origin of a great A'ariety of forms of life. When we realize fully how admirably each organ- ism is fitted to some particular niche in nature, we cannot
![. Text-book of embryology. Embryology. Til ANNELIDA 155. In the two following points, namely, the primitive situation of the mother cells of the meso- derm in the wall of the gut, and the persistence of the protonephridia, Eupoviatus can fairly claim to show, on the whole, a more primitive development than even Polygordius. A detailed study of the develop- ment of this form, or of that of the allied genus Fomatoceros, is greatly to be desired. Turning now to Nereis as an example of the " telescoped" form of development, de- scribed in detail by Wilson (1892), the first difference tha Stock Photo](https://c8.alamy.com/comp/RDJX69/text-book-of-embryology-embryology-til-annelida-155-in-the-two-following-points-namely-the-primitive-situation-of-the-mother-cells-of-the-meso-derm-in-the-wall-of-the-gut-and-the-persistence-of-the-protonephridia-eupoviatus-can-fairly-claim-to-show-on-the-whole-a-more-primitive-development-than-even-polygordius-a-detailed-study-of-the-develop-ment-of-this-form-or-of-that-of-the-allied-genus-fomatoceros-is-greatly-to-be-desired-turning-now-to-nereis-as-an-example-of-the-quot-telescopedquot-form-of-development-de-scribed-in-detail-by-wilson-1892-the-first-difference-tha-RDJX69.jpg ". Text-book of embryology. Embryology. Til ANNELIDA 155. In the two following points, namely, the primitive situation of the mother cells of the meso- derm in the wall of the gut, and the persistence of the protonephridia, Eupoviatus can fairly claim to show, on the whole, a more primitive development than even Polygordius. A detailed study of the develop- ment of this form, or of that of the allied genus Fomatoceros, is greatly to be desired. Turning now to Nereis as an example of the " telescoped" form of development, de- scribed in detail by Wilson (1892), the first difference tha Stock Photo")
RMRDJX69–. Text-book of embryology. Embryology. Til ANNELIDA 155. In the two following points, namely, the primitive situation of the mother cells of the meso- derm in the wall of the gut, and the persistence of the protonephridia, Eupoviatus can fairly claim to show, on the whole, a more primitive development than even Polygordius. A detailed study of the develop- ment of this form, or of that of the allied genus Fomatoceros, is greatly to be desired. Turning now to Nereis as an example of the " telescoped" form of development, de- scribed in detail by Wilson (1892), the first difference tha
RMRE0C01–. Senescence and rejuvenescence. Age; Reproduction. REJUVENESCENCE IN EMBRYO AND LARVA 421 The larval form of the annehds, moUusks, Crustacea, and some other invertebrate groups represents chiefly the head and anterior regions of the body, and metamorphosis consists, not only in changes in the parts already formed, but in the addition of new segments from a growing region just in front of the posterior end. The fully developed larva of the anneHd Nereis, for example, consists of the head and the first three segments, as indicated in Fig. 197, and during the transformation of this free-swimming
RMRDNH9G–. Animal life. Zoology. 2oo ANIMAL LIFE as we review each group in its response to the welfare of the race. The most majestic of these responses is that of. Fn;. 35.—Transformation of a groundling Sea-worm (Nereis), a, into a migrant of pelagic waters, 13, The eyes are enlarged, the paddles more complex and effective. — (After Quatrefages.) migration. Under the stress of a cause not their own, birds and fish assume a new aspect and travel with their mates to far-off, traditional nesting-places. On this journey they behave as creatures possessed.. Please note that these images are extracted fro
![. A textbook of invertebrate morphology [microform]. Invertebrates; Morphology (Animals); Invertébrés; Morphologie (Animaux). FiG. 100,—Anterior End op Nereis virena, c = cirrus. p = piirapodium. t Z tentacle ^^^' ^^^•^'"P''"'<»''^ ornaia (after Vehrill). bonate of lime. Within these tubes the animals permanently reside, and in conformity with this mode of life numerous adaptations of structure are found. The head is usually pro- vided with a number of loner nirri nnA fViQ l^voT^plj."— „-.„ J „ xu^ most part confined to the head region. In some forms, such. Please note that Stock Photo](https://c8.alamy.com/comp/REPGY2/a-textbook-of-invertebrate-morphology-microform-invertebrates-morphology-animals-invertbrs-morphologie-animaux-fig-100anterior-end-op-nereis-virena-c-=-cirrus-p-=-piirapodium-t-z-tentacle-quotpquotlt-ornaia-after-vehrill-bonate-of-lime-within-these-tubes-the-animals-permanently-reside-and-in-conformity-with-this-mode-of-life-numerous-adaptations-of-structure-are-found-the-head-is-usually-pro-vided-with-a-number-of-loner-nirri-nna-fviq-lvotpljquot-j-xu-most-part-confined-to-the-head-region-in-some-forms-such-please-note-that-REPGY2.jpg ". A textbook of invertebrate morphology [microform]. Invertebrates; Morphology (Animals); Invertébrés; Morphologie (Animaux). FiG. 100,—Anterior End op Nereis virena, c = cirrus. p = piirapodium. t Z tentacle ^^^' ^^^•^'"P''"'<»''^ ornaia (after Vehrill). bonate of lime. Within these tubes the animals permanently reside, and in conformity with this mode of life numerous adaptations of structure are found. The head is usually pro- vided with a number of loner nirri nnA fViQ l^voT^plj."— „-.„ J „ xu^ most part confined to the head region. In some forms, such. Please note that Stock Photo")
RMREPGY2–. A textbook of invertebrate morphology [microform]. Invertebrates; Morphology (Animals); Invertébrés; Morphologie (Animaux). FiG. 100,—Anterior End op Nereis virena, c = cirrus. p = piirapodium. t Z tentacle ^^^' ^^^•^'"P''"'<»''^ ornaia (after Vehrill). bonate of lime. Within these tubes the animals permanently reside, and in conformity with this mode of life numerous adaptations of structure are found. The head is usually pro- vided with a number of loner nirri nnA fViQ l^voT^plj."— „-.„ J „ xu^ most part confined to the head region. In some forms, such. Please note that
RMRDHCYH–. A manual of elementary zoology . Zoology. 232 MANUAL OF ELEMENTARY ZOOLOGY youngest segments being at the front end and the old ones dropping off, whereas in the earthworm the youngest seg- ments are those at the hind end and the animal does not shed its segments. The earthworm is adapted to a burrowing habit and a vegetarian diet. Many marine worms, how- ever, while they resemble the earthworm in most respects, lead a free and predaceous existence. Of 10 ,2?f. Fig. 148.—A transverse section through Nereis cultrifer, slightly simplified. The parapodia are shown in perspective. Magnified. —Fr
RMRDJ3EX–. Elements of zoology, to accompany the field and laboratory study of animals. Zoology. THE EA B Til WORM 177 Echiurus/ is segmented when young like Nereis, but eventually it loses its segmentation (Fig. 167). Possibly allied to the Gephyrea is the group of Bryoz'oa,^ or moss-animals. These are noteworthy from the fact that. Fig. 168. — Pedicellina americana, an endoproctous bryozoan. A colony, magnified 15 diams. Photo, of living animals by W. H. C. P. thej^ are compound, many individuals budding off from one another, as in plants. They are found abundantly both in the sea and in fresh water.
RMRE0FKT–. Zoology for high schools and colleges. Zoology. SILURIAN WORM TRACKS. 217 especially on the coast of Brazil. The minute nautilus-like shells of Spirorbis live attached to the fronds of sea-weeds, especially the different kinds of Fucus.. Fig. 154.—Cirratulus grandis.—After Verrill, Many sea-worms are highly phosphorescent,the light emit- ted being intensely green. The tracks of worms like the Nereis of to-day occur in the lower Silurian slates; their bristles, however, were spinulose, as in the larval worms. Thus the type, though highly specialized, has, unlike most specialized groups, a hig
RMRD9KB7–. Zoology : for students and general readers . Zoology. SILURIAN WORM TRACKS. 337 especially on the coast of Brazil. The minute nautilus-like shells of Spirorbis live attached to the fronds of sea-weeds especially the different kinds of Fucus.. Fig. W.— Cirratulm grandis.—After Verrill. Many sea-worms are highly iihosphorescent,the light emit- ted being intensely green. The tracks of worms like the Nereis of to-day occur in the lower Silurian slates; their bristles, however, were spinulose, as in the larval worms. Thus the type, though highly specialized, has, unlike most sjDecialized groups,
RMRE081D–. A text-book of invertebrate morphology. Invertebrates. FiQ. 100.âAntbriob End of Nereis virena. c = cirrus. p = parapodium. pi = palp. t = tentacle.. Fia. 101. â Amphiirite ornata (after Verkill). bonate of lime. Within these tubes the animals permanently reside, and in conformity with this mode of life numerous adaptations of structure are found. The head is usually pro- vided with a number of long cirri and the branchiae are for the most part confined to the head region. In some forms such. Please note that these images are extracted from scanned page images that may have been digitally en
![. Zoology. Zoology. 52 ZOOLOGY. Our commonest sea-worm, sometimes culled the "clam- worm" is Nereis virens (Fig. 5C). It lives between tide- marks in holes in the mud, and can be readily obtained. The body, after the head, eyes, tentacles, and bristle-bear- FiQ. 55. —Clymenella torquata, natural size. ing feet have been carefully studied, can be opened along the back by a pair of fine scissors and the dorsal and ven- tral red blood-vessels with their connecting branches ob- served, as well as the alimentary canal and the nervous system. This worm is very voracious, thrusting out its Stock Photo](https://c8.alamy.com/comp/RDTDYC/zoology-zoology-52-zoology-our-commonest-sea-worm-sometimes-culled-the-quotclam-wormquot-is-nereis-virens-fig-5c-it-lives-between-tide-marks-in-holes-in-the-mud-and-can-be-readily-obtained-the-body-after-the-head-eyes-tentacles-and-bristle-bear-fiq-55-clymenella-torquata-natural-size-ing-feet-have-been-carefully-studied-can-be-opened-along-the-back-by-a-pair-of-fine-scissors-and-the-dorsal-and-ven-tral-red-blood-vessels-with-their-connecting-branches-ob-served-as-well-as-the-alimentary-canal-and-the-nervous-system-this-worm-is-very-voracious-thrusting-out-its-RDTDYC.jpg ". Zoology. Zoology. 52 ZOOLOGY. Our commonest sea-worm, sometimes culled the "clam- worm" is Nereis virens (Fig. 5C). It lives between tide- marks in holes in the mud, and can be readily obtained. The body, after the head, eyes, tentacles, and bristle-bear- FiQ. 55. —Clymenella torquata, natural size. ing feet have been carefully studied, can be opened along the back by a pair of fine scissors and the dorsal and ven- tral red blood-vessels with their connecting branches ob- served, as well as the alimentary canal and the nervous system. This worm is very voracious, thrusting out its Stock Photo")
RMRDTDYC–. Zoology. Zoology. 52 ZOOLOGY. Our commonest sea-worm, sometimes culled the "clam- worm" is Nereis virens (Fig. 5C). It lives between tide- marks in holes in the mud, and can be readily obtained. The body, after the head, eyes, tentacles, and bristle-bear- FiQ. 55. —Clymenella torquata, natural size. ing feet have been carefully studied, can be opened along the back by a pair of fine scissors and the dorsal and ven- tral red blood-vessels with their connecting branches ob- served, as well as the alimentary canal and the nervous system. This worm is very voracious, thrusting out its
RMRDJ3X3–. A manual of elementary zoology . Zoology. ANNELIDA : THE EARTHWORM, NEREIS 233 is a flat, hollow, vertical process of the body-wall, standing out at the side of its segment and serving to pull the animal along in creeping, or to row it in swimming. It is cleft into two principal lobes, a dorsal notopodium and a ventral neuropodium. Each of these is again divided into smaller lobes and bears at its base a slender process known as a cirrus. A stout, deeply embedded seta or aciculum supports the notopodium and another the neuropodium. The front end of the body is modified to form a definite hea
RMRDJ704–. A manual of zoology. . hni ^>nepk. e-T - Fig. 109.— Nereis dumerilii. Semi-diagrammatic view of the anterior portion of the body, with the dorsal body-wall removed, so as to show the alimentary canal, the septa, the blood-vessels and the nephridia; a portion of the intestine removed so as to show the ventral blood-vessel and nerve-cord which lie below, dors, vess, dorsal vessel; gl, oesophageal glands; ini, beginning of intestine; ne. co, nerve cord; neph. nephridia; ces, oesophagus; palp, palp; pa?-a, parapodia; perist, peristome; perist. tent, peristomial tentacles; //;, pharynx with
RMRDHCYN–. A manual of elementary zoology . Zoology. ANNELIDA : THE EARTHWORM, NEREIS 229 worm, along a groove, into the spermathecse of the other, after which the worms separate. The eggs are laid in a cocoon, which is secreted by the clitellum as a broad band round the body and passed forwards over the head. The cocoon contains a nutrient fluid, and into it sperm which has been received from another worm is transferred in a little packet or spefmatophore. In passing over the head -p.v.s.. Fig. 146.—A dissection of the reproductive organs of an earth- worm. The dissection is made from above, and the m
![. Handbook of zoology with examples from Canadian species, recent and fossil [microform]. Zoology; Invertebrates; Zoologie; Invertébrés. 18G I'KOVINCK ANNUKA'IA. of the genus Nereis, in whicli the hody is greatly elongated, witii very numerous joints, having setaceous feet on each joint, to which are added llattened apjjendages for swimming. These also appear to serve as gills. The mouth is armed with a pair of strong mandibles. These worms abound under stones on muddy shores, and in similar jilaces. N. /^c/axiir, Lin., N. i^randis, St., and other si)ecies, are .ound on our coast. Phyllodoccca Stock Photo](https://c8.alamy.com/comp/RJ2EHR/handbook-of-zoology-with-examples-from-canadian-species-recent-and-fossil-microform-zoology-invertebrates-zoologie-invertbrs-18g-ikovinck-annukaia-of-the-genus-nereis-in-whicli-the-hody-is-greatly-elongated-witii-very-numerous-joints-having-setaceous-feet-on-each-joint-to-which-are-added-llattened-apjjendages-for-swimming-these-also-appear-to-serve-as-gills-the-mouth-is-armed-with-a-pair-of-strong-mandibles-these-worms-abound-under-stones-on-muddy-shores-and-in-similar-jilaces-n-caxiir-lin-n-irandis-st-and-other-siecies-are-ound-on-our-coast-phyllodoccca-RJ2EHR.jpg ". Handbook of zoology with examples from Canadian species, recent and fossil [microform]. Zoology; Invertebrates; Zoologie; Invertébrés. 18G I'KOVINCK ANNUKA'IA. of the genus Nereis, in whicli the hody is greatly elongated, witii very numerous joints, having setaceous feet on each joint, to which are added llattened apjjendages for swimming. These also appear to serve as gills. The mouth is armed with a pair of strong mandibles. These worms abound under stones on muddy shores, and in similar jilaces. N. /^c/axiir, Lin., N. i^randis, St., and other si)ecies, are .ound on our coast. Phyllodoccca Stock Photo")
RMRJ2EHR–. Handbook of zoology with examples from Canadian species, recent and fossil [microform]. Zoology; Invertebrates; Zoologie; Invertébrés. 18G I'KOVINCK ANNUKA'IA. of the genus Nereis, in whicli the hody is greatly elongated, witii very numerous joints, having setaceous feet on each joint, to which are added llattened apjjendages for swimming. These also appear to serve as gills. The mouth is armed with a pair of strong mandibles. These worms abound under stones on muddy shores, and in similar jilaces. N. /^c/axiir, Lin., N. i^randis, St., and other si)ecies, are .ound on our coast. Phyllodoccca
RMRDJ3B4–. Elements of zoology, to accompany the field and laboratory study of animals. Zoology. Nereis lives on both plant and animal food. To capture its pre}' it thrusts out a long proboscis, provided with two power- ful jaws. The thrusting-out consists essentially of a rolling in.side out,âjust as the finger of a glove may be rolled inside out. When the pro- boscis is rolled in again, the jaws, retaining their grip on the food, carry it into the food canal.' While many kinds of small animals serve Nereis as food, it is itself devoured by various fishes which dig it out of the sand or capture it whe
RMRE0FN1–. Zoology for high schools and colleges. Zoology. 206 ZOOLOGY. The student, in familiarizing himself with the structure and mode of growth of the leech, the common earth-worm. Fig. 142.—Transverse section of a worm, of AmpMoxas^ and a higlier vertebrate contrasted, a, skin ; ^, dermal connective layer; c, mnscles; d, segmental organ ; A, arterial, and i, venous blood-vessel; g, intestine; I, notocbord.—After Haeckel. and the Nereis, will obtain a good idea of the essential char- acteristics of the entire class. Order 1. Hirudinea.—In the leech (Fig. 143), Hirudo medicinalis Linn., the type of
![. A textbook of invertebrate morphology [microform]. Invertebrates; Morphology (Animals); Invertébrés; Morphologie (Animaux). TYPE ANNELIDA. 206 im jh )e le re. FlG, c 98.—Pauapodium of Nereis virena. br = bi'Hiicliia. de = dorsal cirrus. 8 — setae. ve = ventral cirrus. cations of the cirri or brauclies arising from tliem, and respiratory in function, also occur. Muscles pass from the body-wall to the parapodia, which thus ^..^..^s-dc become important organs of locomo- tion and in some of the actively swim- ming species assume a more or less flattened plate-like form. The head segment is gen Stock Photo](https://c8.alamy.com/comp/RJ4P0W/a-textbook-of-invertebrate-morphology-microform-invertebrates-morphology-animals-invertbrs-morphologie-animaux-type-annelida-206-im-jh-e-le-re-flg-c-98pauapodium-of-nereis-virena-br-=-bihiicliia-de-=-dorsal-cirrus-8-setae-ve-=-ventral-cirrus-cations-of-the-cirri-or-brauclies-arising-from-tliem-and-respiratory-in-function-also-occur-muscles-pass-from-the-body-wall-to-the-parapodia-which-thus-s-dc-become-important-organs-of-locomo-tion-and-in-some-of-the-actively-swim-ming-species-assume-a-more-or-less-flattened-plate-like-form-the-head-segment-is-gen-RJ4P0W.jpg ". A textbook of invertebrate morphology [microform]. Invertebrates; Morphology (Animals); Invertébrés; Morphologie (Animaux). TYPE ANNELIDA. 206 im jh )e le re. FlG, c 98.—Pauapodium of Nereis virena. br = bi'Hiicliia. de = dorsal cirrus. 8 — setae. ve = ventral cirrus. cations of the cirri or brauclies arising from tliem, and respiratory in function, also occur. Muscles pass from the body-wall to the parapodia, which thus ^..^..^s-dc become important organs of locomo- tion and in some of the actively swim- ming species assume a more or less flattened plate-like form. The head segment is gen Stock Photo")
RMRJ4P0W–. A textbook of invertebrate morphology [microform]. Invertebrates; Morphology (Animals); Invertébrés; Morphologie (Animaux). TYPE ANNELIDA. 206 im jh )e le re. FlG, c 98.—Pauapodium of Nereis virena. br = bi'Hiicliia. de = dorsal cirrus. 8 — setae. ve = ventral cirrus. cations of the cirri or brauclies arising from tliem, and respiratory in function, also occur. Muscles pass from the body-wall to the parapodia, which thus ^..^..^s-dc become important organs of locomo- tion and in some of the actively swim- ming species assume a more or less flattened plate-like form. The head segment is gen
RMRD9KC6–. Zoology : for students and general readers . Zoology. 226 ZOOLOGY. The student, in familiarizing himself with the structure and mode of growth of the leech, the common earth-worm. Fig. 148.—Transverse section of a worm, of AmpWoxtis, and a higher -vertebrate contrasted, o, skin ; 6, dermal connective layer; c, muscles; d, segmental organ ; h, arterial, and i, venous blood-vessel; g^ intestine ; I, notochord.—After Haeckel. and the Nereis, will obtain a good idea of the essential char- acteristics of the entire class. Order 1. Hirudinea.—In the leech (Fig. 149), Hirudo medicinalis Linn., the
RMRDCPP7–. Heredity in relation to evolution and animal breeding, . Heredity. HEREDITY. Fig. 2. — Fertilization of the egg of Nereis. A. The sperm has entered the egg and is forming a minute nucleus at o*. The egg-nucleus is breaking up preparatory to the first maturation division. B. The egg-nucleus is undergoing the first maturation division. Notice the con- spicuous rod-like chromosomes separating into two groups. The sperm-nucleus (,J) is now larger and lies deeper in the egg. C. A small polar-cell has been formed above by the first maturation division of the egg. A second division is in progress a
RMRDJ3G8–. Elements of zoology, to accompany the field and laboratory study of animals. Zoology. pra£si f^^ hal/^ y^:^^. Tie.co Fig. 161. — Semi-diagrammatic view of anterior part of body of Nereis with dorsal wall removed so as to show alimentary canal, oes, int; the septa ; blood-vessels (dors, vess, vent, vess.) ; and the nephridia (neph). Behind, intestine removed to show ventral blood-vessel and nerve cord (ne. co) ; gl, glands of esophagus ; para, swimming feet; perist, peristome ; perist. tent, tentacles of the peristome ; ph, pharynx and its jaws ; praest, part of head lying above mouth. From P
RMRDJ6XD–. A manual of zoology. PHYLUM ANNULATA â 99 possess branchiaz, organs which are absent as such in Nereis, in the form of simple or branched vascular processes ar- ranged in pairs on the dorsal side of the parapodia, through- out the whole or a part of the length of the body, or (Fig. 113) confined to the head-end. All such marine worms belong to the sub-class Polyehseta of the Chsetopoda. Though many of them move about freely like Nereis, others live permanently in tubes of a membranous or shelly mate-. FlG. 114.âA, B, C, three stages in the development of the Trochosphere of Eupomatus, from t
RMRDJ3BH–. Elements of zoology, to accompany the field and laboratory study of animals. Zoology. ISG ZOOLOGY. Nereis lives on both plant and animal food. To capture its pre}' it thrusts out a long proboscis, provided with two power- ful jaws. The thrusting-out consists essentially of a rolling in.side out,—just as the finger of a glove may be rolled inside out. When the pro- boscis is rolled in again, the jaws, retaining their grip on the food, carry it into the food canal.' While many kinds of small animals serve Nereis as food, it is itself devoured by various fishes which dig it out of the sand or c
RMRDHR67–. A manual of elementary zoology . Zoology. ANNELIDA .- THE EARTHWORM, NEREIS ±1$ and lying end to end. The cilia set up a current which sweeps in and carries off the excretory granules formed by the yellow cells, together with substances taken from the blood and excreted by the walls of the tubes. Some of these, in the form of granules, colour the brown part of the tube. Earthworms have no special respiratory organs, but an inter-. FlG. 142.—A diagram of a nephridium of the earthworm. br.t.. Brown, ciliated tube; m.t., muscular tube; n.c.t., glandular, non-ciliated tube; n.t., narrow tube, ci
RMRDT4FF–. First lessons in zoology. Zoology. IVORMS, CRAYFISH, CENT IP EDS, ETC. 149 The earthworms, leeches, vinegar-eels, hairworms, and trichina belong to the great branch Vermes. The crayfish.—The crayfish, or crawfish, is found in most fresh-water ponds and streams of the United States west of Massachusetts. Crayfishes may be taken by a net baited with dead fish, or may be caught in a trap. Fig. III.—A group of marine worms; at the left a gephyrean, Dendroslonimn cronjhchni, the upper right-hand one a nereid, Nereis sp., the lower right-hand one, Polynoe brevisetosa. (From living specimens in a t
RMRE0C18–. Senescence and rejuvenescence. Age; Reproduction. 336 SENESCENCE AND REJUVENESCENCE three species of turbellarian worms, forms related to Planaria; Fig 165 is the non-motile spermatozoon of the nematode worm Ascaris megalocephala; Figs. 166 and 167 show the two forms of spermatozoa found in certain snails; Figs. 168, 169, and 170 are. Figs. 154-157.—Male gametes of various animals: Fig. 154, Nereis, an annelid worm (from F. R. Lillie, '12); Fig. 155, Copris, a beetle (from Ballowitz, '^od); Fig. 156, Raja, a fish (from Ballowitz, '906); Fig. 157, Triton, a salamander (from Ballowitz, '906).
RMRDC10G–. The birds of Australia. Birds. THE WHITE-FACED STOKM PETREL 51 Nest a slight hollow under rocks or other cover. One egg is laid; colour white, with some very small faint brownish spots on the larger end; it measures about 1.27 x .87 inch.. Yellow-webbed Storm Petrel: Oceanites oceanicus. Meyer. The Grey-backed Storm Petrel. Garrodia nereis. Southern Ocean. Greyish black, darkest on head, becoming greyer towards rump; wings black; median and tail coverts and tail have narrow edge of white; under surface white, sides streaked with grey; tail grey, tipped with black. Total length about 6.7 inch
RMRE3NGK–. Text book of zoology. Zoology. Fig. 135.. Fig. 134. Diagram of the reproductive apparatus of an Earth-worm ; the animal is dissected from the mid-dorsal line and spread out. 8—14, 8th to 14th bristle-hearing seg- ments. 0 ovary, od oviduct, sb vesicula seminalis, sg spermatheca, t testis, vd vas deferens, vd' its outer end, ce receptaculum ovorum. The transverse hnes represent the septa.—Orig.- Fig. 135. Larva of Nereis, a anus, m mouth, o eye.—After Gotte. Asexual reproduction occurs in not a few members of both groups. In some cases tbere is a simple transverse fission; the animal divides
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