. North American geology and palaeontology for the use of amateurs, students, and scientists [microform]. Paleontology; Paleontology; Geology; Paléontologie; Paléontologie; Géologie. 332 BNACHIOPODA. [ACA.—AMU. Famii-y Riiyn<'iionki.i,ii)<ic.—Caniarella, Caniarophoria, Eatonia, PjichwaMiu, Leiorhyijchus, Rhynchonolla, Rhynchotreta, HtenuHchisina. Family HirHONoTKicTibv,, —Acrotliele, Acrotreta, Iphiilue, Kutorgina, Sclii/,. an)l)un, HiphoDotreta. Family Si'ikikkkid/K.—Amboc(«lia, Cyrtia. Cyrtina, Martinia, Spirifera, .Spii if- eriiia, Syntrielasnia, Hyringothyris, Trigonotreta. Family St

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. North American geology and palaeontology for the use of amateurs, students, and scientists [microform]. Paleontology; Paleontology; Geology; Paléontologie; Paléontologie; Géologie. 332 BNACHIOPODA. [ACA.—AMU. Famii-y Riiyn<'iionki.i, ii)<ic.—Caniarella, Caniarophoria, Eatonia, PjichwaMiu, Leiorhyijchus, Rhynchonolla, Rhynchotreta, HtenuHchisina. Family HirHONoTKicTibv, , —Acrotliele, Acrotreta, Iphiilue, Kutorgina, Sclii/, . an)l)un, HiphoDotreta. Family Si'ikikkkid/K.—Amboc(«lia, Cyrtia. Cyrtina, Martinia, Spirifera, .Spii if- eriiia, Syntrielasnia, Hyringothyris, Trigonotreta. Family Stroi'homknid/K.—Lepttenu, Strcptorliynclius, Strophodouta, Siro. pliomena, Htrophonella. Family Tkrehhatulid.k.—Centronella, Cryptouella, Loptocu-lia, Renssoliiiiii, Terebratula, TropidoieptuH, Vitulina, Waldheiiuia. Family Trimkrellid^k.—Diiiobolus, Lingulops, Monomerella, Triinerellu. Family Trii'lesiid.k—Triplegia.. AcAMiioNA, Wliite, 1862, Proo. Boat. Soc. Nat. Hist., vol. (>, p. 27. [Etv «*«', point; amb(m, uinbo.j Syn. for Kuinotria. prima, see Eumetria prima. AcHOTHEi.K, LinnarBHon, 187«, Bihangtill K. Vet. Akad. Handl., p. 20, Swed. Acad. kSci. on tlie Brncldopoda of the Para- doxides beds. [Kty. akro'», pointed; theky nipple; from tbe aj)ex of tlie valve.] Snell tldn, corneouB, subcircn- lar in outline, depressed, concentrically marked, and sometimeH radiated ; apex of ventral valve teat-like; subcentral or near the posterior mar((in, perforated; dorsal valve slightly convex, posterior margin slightly roflexed, and internally a low median longitudinal septum rep- resented by an in.pression in the cast. Tyjje A. coriacea. dichotoma, Walcott, 1886, Monogr. U. S. Geo. Sur., vol. 8, p. 14, Up. Taconic. matthewi, Ilartt, 1868, (Lingula matthewi, ) Acad. Geol., p. 644, St. John Gr. subrtidua. White, 1874, (Acrotreta subdsidua, ) Rep. Invert. Foss., p. 6, and Geo. Sur. W. 100th Mer., vol. 4, p. 34, Up. Taconic. Aero t re ta, Kutorga, 1848, Uber die Sii