. North American geology and palaeontology for the use of amateurs, students, and scientists [microform]. Paleontology; Paleontology; Geology; Paléontologie; Paléontologie; Géologie. tci'iial cast of left Fia. 895.âPleihoinytilus ponderosus. aronaceus. Hall, 1870, (Mytilarca arena- cea,) Prelim. Notice Lam. Shells, p. 20, and Pal. N. Y., vol. 5, pt. 1, p. 253, Kohoharie grit, knappi, Hall, 1884, Pal. N. Y., vol. 5, pt. 1, p. 250, Ham. Gr. mytilimeris, Conrad, 1842, (Inoceramus mytilimeris,) Jour. Acad. Nat. Sci., vol. 8, p. 246, Low. Held. Gr. oviformis, Conrad, 1842, (Inoceramus ov
. North American geology and palaeontology for the use of amateurs, students, and scientists [microform]. Paleontology; Paleontology; Geology; Paléontologie; Paléontologie; Géologie. tci'iial cast of left Fia. 895.âPleihoinytilus ponderosus. aronaceus. Hall, 1870, (Mytilarca arena- cea,) Prelim. Notice Lam. Shells, p. 20, and Pal. N. Y., vol. 5, pt. 1, p. 253, Kohoharie grit, knappi, Hall, 1884, Pal. N. Y., vol. 5, pt. 1, p. 250, Ham. Gr. mytilimeris, Conrad, 1842, (Inoceramus mytilimeris,) Jour. Acad. Nat. Sci., vol. 8, p. 246, Low. Held. Gr. oviformis, Conrad, 1842, (Inoceramus oviformis,) Jour. Acad. Nat. Sci., vol. 8, p. 240, and Pal. N. Y., vol. 5, pt. 1, p. 255, Ham. Gr. ponderosus. Hall, 1870, (Mytilarca pon- derosa.) Prelim. Notice Lam. Shells, p. 21, and Pal. N. Y., vol. 5, pt. 1, p. 254, Up. Held. Gr. Pleuroimiokub, King, 1844, Ann. Mag. Nat. Hist., vol. 14, p. 313. [pjty. pleuron, a rib; phoros, bearing.] Inequilateral, longitudinally oblong or subovate; two cardinal teeth in each valve, alternately interlocking and divergent; one pos- terior Inleral tooth in each valve, the receiving tooth in the left valve; an- terior adductor scar deep, and bounded posteriorly by a ridge ; pallial line sim- ple. Type P. costal us. angulatus, Meek & Worthen, 1865, Proc. Acad. Nat. Sci. Phil., p. 247, and Geo. Sur. III., vol. 6, p. 529, Coal Meas. calhouni. Meek & Hayden, 1858, (Ed- monia calhouni,) Trans. Alb. Inst., vol. 4, p. 80, and Pal. Up. Mo., p. 62, Per- mian Gr. chesterensis, Worthen, 1884, Bull. No. 2, 111. St. Mus. Ni;t. Hist., p. 16, and Geo. Sur. 111., vol. 8, p. 123, Kaskaskia Gr. costatiformis, Meek & Worthen, 1865, Proc. Acad. Nat. Sci. Phil., p. 247, and Geo. Sur. 111., vol. 3, p. 535, Keokuk Gr, meeki, Walcott, 1885, Monogr. U. S. Geo. Sur., vol. 8, p. 246, Carboniferous. minimus, Worthen, 1884, Bull. No. 2, 111. St. Mus. Nat. Hist., i>. 17, and Geo. Sur. III., vol. 8, p. 124, St. Louis Gr. monroensis, Worthen, 1884, Bul
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