. North American geology and palaeontology for the use of amateurs, students, and scientists [microform]. Paleontology; Paleontology; Geology; Paléontologie; Paléontologie; Géologie. Fio. 018.—Wchlzodus moorest. RIglit valve, poste- rior part broken ott'. nauvooensis, Worthen, 1884, Bull. No. 2, HI. St. Mas. Nat. Hist., p. 10, and Geo. Sur. 111., vol. 8, p. 108, Keokuk (ir. orbicularis, Walcott, 1885, Monogr. U. S. Geo. Sur., vol. 8, p. 181, Devonian. ovatuB, Meek & Hayden, 1858, (Axinus ovatus,) Proc. Acad. Nat. Sci. Phil., p. 262, and Pal. Up. Mo., p. 59, Per- mian Gr. patnlus. Hall, 188
. North American geology and palaeontology for the use of amateurs, students, and scientists [microform]. Paleontology; Paleontology; Geology; Paléontologie; Paléontologie; Géologie. Fio. 018.—Wchlzodus moorest. RIglit valve, poste- rior part broken ott'. nauvooensis, Worthen, 1884, Bull. No. 2, HI. St. Mas. Nat. Hist., p. 10, and Geo. Sur. 111., vol. 8, p. 108, Keokuk (ir. orbicularis, Walcott, 1885, Monogr. U. S. Geo. Sur., vol. 8, p. 181, Devonian. ovatuB, Meek & Hayden, 1858, (Axinus ovatus,) Proc. Acad. Nat. Sci. Phil., p. 262, and Pal. Up. Mo., p. 59, Per- mian Gr. patnlus. Hall, 1886, Pal. N. Y., vo\. 5, p. 457, Chemung Gr. perelegans, Meek & Worthen, 1870, Proc. Acad. Nat. Sci. Phil., p. 42, and Geo. Sur. 111., vol. 5, p. 581, Coal Meas. I i. Kio. 919.—Schtzodus mooresi. Interior of light valve, Bliowliig palllal line and place of sub- cordate muscular Impression and liiiige-teelh. pintoensis, Walcott, 1885, Monogr. U. 8. Geo. Sur., vol. 8, p. 253, Subcarbonif- erous. quadrangtilam, see Cytherodon quadran- gularis. randolphensis, "Worthen, (in press,) Geo. Sur. 111., vol. 8, p. 110, Kaska-skia Gr. rossicuB, Veriieuil, 1845, Geo. Russ., vol. 2, p. 309. Permian Gr. subtrigonalis, Meek, 1871, Proc. Acad. Nat. Sci., p. 166, Waverly Gr. triangularis, Swallow, 1858, Trans. St. Louis Acad. Sci., p. 193, Permian Gr. tumidus, see Cytherodon tumidus. ulrichi, Worthen, (in jiress,) Geo. Sur. 111., vol. 8, p. 110, Up. Coal Meas. varsoviensis, Worllien, 1884, Bull. No. 2, 111. St. Mus. Nat. Hist., p. 10, and Geo. Sur. 111., vol. 8, p. 107, Keokuk Gr. wheeleri, Swallow, 1862, (Littorina wheel- eri,) Trans. St. Louis Acad. Sci., vol. 1, p. 658, and Pal. E. Neb., p. 209, Coal Meas. Sedgwickia, McCoy, 1844, Snyop. Garb. Foss. Ireland, p. 61. [Ety. proper name.] Nearly equivalve, inequilateral, de- pressed, oblong, or suboval, very thin; anterior side not quite closed, often gibbous; posterior side longer, more compressed, and gaping; beaks prom- inent, tu
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