. North American geology and palaeontology for the use of amateurs, students, and scientists [microform]. Paleontology; Paleontology; Geology; Paléontologie; Paléontologie; Géologie. -Cypriciirdcllii llstrlata. valve, one bc- jr, the posterior iirned oblic|uely angular pit for er valve; long, nterior cardinal a projection iterior side bev- tliin, ligament deep cavity; distinct, shal- simple. Type (Microdon bel- Nat. Sol., vol. 8, complanata, Hall, 1870, (Microdon com- planatus,) Prelim. Notice Lam. Shells, p. 33, and Pal. N. Y., vol. 5, pi. 42, fig. 22, and nl. 74, figs. 14 to 10, Ham. Gr. con
. North American geology and palaeontology for the use of amateurs, students, and scientists [microform]. Paleontology; Paleontology; Geology; Paléontologie; Paléontologie; Géologie. -Cypriciirdcllii llstrlata. valve, one bc- jr, the posterior iirned oblic|uely angular pit for er valve; long, nterior cardinal a projection iterior side bev- tliin, ligament deep cavity; distinct, shal- simple. Type (Microdon bel- Nat. Sol., vol. 8, complanata, Hall, 1870, (Microdon com- planatus,) Prelim. Notice Lam. Shells, p. 33, and Pal. N. Y., vol. 5, pi. 42, fig. 22, and nl. 74, figs. 14 to 10, Ham. Gr. connata, Walcott, 1885, Monogr. U. 8. Geo. Hur., vol. 8, p. 250, Subcarboniferous. ^'regaria. Hall, 1870, (Microdon gregarius,) Prelim. Not. Lam. Shells, p. 32, and Pal. N. Y., vol. 6, pi. 73, figs. 1-6, and pi. 74, figs. 1-4, Ham. Gr. macrostriata, Walcott, 1885, Monogc U. S., Geo. Sur., vol. 8, p. 180, De- vonian. major, Hall, 1885, Pal. N. Y., vol. 5, p. 307, Up. Held. Gr. nncleata, Hall, 1858, Trans. Alb. Inst., vol. 4, p. 17, and Geo. Sur. Iowa, p. 663, oblonga, Hall, 1858, Trans. Alb. Inst., vol. 4, p. 18, and Bull. Am. Mus. Nat. Hist., p. 65, Warsaw Gr. plicata, see Goniophora plicata. <iuadrata. White & Whitfield, 1862, Proc. Bost. Soc. Nat. Hist., vol. 8, p. 300, Kinderhook Gr. reservata. Hall, 1870, (Microdon reserva- tus,) Prelim. Notice Lam. Shells, p. 33, and Pal. N. Y., vol. 5, pi. 74, figs. 11-13, Waverly Gr. Hubelliptica, Hall, 1858, Trans. Alb. Inst., vol. 4, p. 17, and Geo. Sur. Iowa, p. 664, Warsaw Gr. tenuistriata. Hall, 1870, (Microdon ten- uistriatuB,) Prelim. Notice Lam. Shells, p. 32, and Pal. N. Y., vol. 5, pi. 73, figs. 23 to 30, and pi. 74, figs. 20,21, Ham. Gr. Cypricardia, Lamarck, 1801, Syst. An. sans Vert. [Ety. from the two genera Cy- prina and Cardium.'] Oblong, oblique posterior ridge; umbones anterior, de- pressed ; ligament exter jal, in deep, narrow grooves; cardinal teeth two, lateral one, in each valve, sometimes obscure; muscular i
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