. North American geology and palaeontology for the use of amateurs, students, and scientists [microform]. Paleontology; Paleontology; Geology; Paléontologie; Paléontologie; Géologie. rhomboides, Meek, 1871. Proc. Acad. Nat. Sci. Phil., p. 72, and Ohio Pal., vol. 2, p. 302, Waverly Gr. rustica, Billings, 1874, Pal. Foss., vol. 2, p. 139, Up. Sil. secunda. Hall, 1870, Prelim. Notice Lam. Shells, p. 54, and Pal. N. Y., vol. 5, pi. 59, figs. 2-5, Up. Held. Gr. subarcuata, Hall, 1870, Prelim. Notice Lam. Shells, p. 61, and Pal. N., vol. 5^ pi. Gl, figs. 10-22, Chemung Gr. undata. Hall, 1883, Pal. N
. North American geology and palaeontology for the use of amateurs, students, and scientists [microform]. Paleontology; Paleontology; Geology; Paléontologie; Paléontologie; Géologie. rhomboides, Meek, 1871. Proc. Acad. Nat. Sci. Phil., p. 72, and Ohio Pal., vol. 2, p. 302, Waverly Gr. rustica, Billings, 1874, Pal. Foss., vol. 2, p. 139, Up. Sil. secunda. Hall, 1870, Prelim. Notice Lam. Shells, p. 54, and Pal. N. Y., vol. 5, pi. 59, figs. 2-5, Up. Held. Gr. subarcuata, Hall, 1870, Prelim. Notice Lam. Shells, p. 61, and Pal. N., vol. 5^ pi. Gl, figs. 10-22, Chemung Gr. undata. Hall, 1883, Pal. N. Y., vol. 5, p. 379, Chemung Gr. ventricosa, Meek, 1871, Proc. Acad. Nat. Sci. Phil., p. 73, and Ohio Pal., vol. 2, p. 303, Waverly Gr. Oryphorhynchus, Meek, 1864, Am. Jour. Sci. and Arts. Not. defined. luoNiA, Billings, 1875, Can. Nat. and Geol., vol. 8, p. 301. [Ety. proper name.] Ir- regularly ovate, compressed; one ex- tremity larger than the other, with beaks turned toward the larger end; concave depression from the umbones to the posterior ventral margin; sub- ovate muscular impression in the upper half of the posterior extremity. Type 1. canadensis. canadensis, Billings, 1875, Can. Nat. and Geol., vol. 8, p. 301, Corniferous Gr. costulata, Whit- eaves, 1884, Pal. Fobs., vol. 3, p. 15,Guelph Gr. galtensis, Whit- eaves, 1884, Pal. Fobs., vol. 3, ,Guelph Gr. Fio. galtensis. sinuata, Hall, 1859, (Anatina sinuata,) Pal. N. Y., vol. 3, p. 265, Low. Held. Gr. InoceramuB, Sowerby, 1818, Min. Conch., vol. 2. This genus is unknown in Ameri- can Palaeozoic rocks. chemungensis, see Mytilarca chemungensis. mytiUmeris, see Plethomytilus mytilimeris. ovi/ormis, see Plethomytilus oviformis. IscHYRiNiA, Billings, 1866, Catal. Sil. Foss. Antic, p. 16. [Ety. ischyros, strong.] Equi'.alve, inequilateral; two strong ridges radiating from the beak in the interior of each valve. Type I. win- chelli. plicata, Bill- ings, 18 66, Catal. Sil. Foss. Antic, p. 52, Anti- costi G
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