. North American geology and palaeontology for the use of amateurs, students, and scientists [microform]. Paleontology; Paleontology; Geology; Paléontologie; Paléontologie; Géologie. 41() GASTEROPODA. Ll' cyrtolites, McChesney, 1859, Pal. Foss., p. 71, Coal Meas. / (lentalium. Hall, 18G2, 15th Rep. N. Y. Mu8. Nat. Hist., p. 29, and Pal. N. Y., vol. 5, pt. 2, p. 2, Up. Held. Gr. dilatatum, Hall, 1859, Pal. N. Y., vol. 3, p. 322, Low. Held. Gr. dumoaum, Conrad, 1840, Ann. Rep. N. Y., p. 205, and Pal. N. Y., vol. 5, pt. 2, p. 14, Up. Held. Gr. V V V V si. Fig. tiW.—Plutyceras dumosum. dumosu
. North American geology and palaeontology for the use of amateurs, students, and scientists [microform]. Paleontology; Paleontology; Geology; Paléontologie; Paléontologie; Géologie. 41() GASTEROPODA. Ll' cyrtolites, McChesney, 1859, Pal. Foss., p. 71, Coal Meas. / (lentalium. Hall, 18G2, 15th Rep. N. Y. Mu8. Nat. Hist., p. 29, and Pal. N. Y., vol. 5, pt. 2, p. 2, Up. Held. Gr. dilatatum, Hall, 1859, Pal. N. Y., vol. 3, p. 322, Low. Held. Gr. dumoaum, Conrad, 1840, Ann. Rep. N. Y., p. 205, and Pal. N. Y., vol. 5, pt. 2, p. 14, Up. Held. Gr. V V V V si. Fig. tiW.—Plutyceras dumosum. dumosum var. attenuatum. Meek, 1871, Proc. Acad. Nat. Sci., p. 75, and Ohio Pal., vol. 1, p. 212, Up. Held. Gr. dumosum var. rarispinum. Hall, 1862, 15th Rep. Mus. Nat. Hist., p. 38,and Pal. N. Y., vol. 5, pt. 2, p. 16, Up. Held. Gr. echinatum. Hall, 1862, i5th Rep. N. Y. Mus. Nat. Hist., p. 38, and Pal. N. Y., vol. 5, pt. 2, p. 13, Ham. Gr. elongatum. Hall, 1859, Pal. N, Y., vol. 3, p. 335, Low. Held. Gr. equilaterale, Hall, 1860, Supp. to vol. 1, pt. 2, Iowa Rep., p. 89, and Geo. Sur. III., vol. 5, p. 518, Keokuk Gr. erectum. Hall, 1843, (Aeroculia erecta,) Geo. 4th Dist. N. Y., p. i74, and Pal. N. Y., vol. 5, pt. 2, p. 5, Ccrnif. & Ham. Grs. txpwmnm, see Strophostylus expansus. fissurellum, Hall, 1860, Supp. to Geo. Rep. Iowa, vol. 1, pt. 2, p. 90, and Geo. Sur. 111., vol. 5, p. 519, Keokuk Gr. fluctuosum, Ulrich, 1886, Cont. to Am. Pal., p. 31, Up. Held. Gr. formosum, Keyes, 1888, Proc. Am. Phil. Soc, (author's copy, p. 14,) Kinder- hook Gr. fornicatum, Hall, 1862, 15th Rep. N. Y. Mus. Nat. Hist., p. 35, and Pal', N. Y., vol. 5, pt. 2, p. 11, Up. Held. Gr. fornicatum var. contraotum, Hall, 1876, Illust. Devonian Foss., pi. 5, Up. Held. Gr. gebhardi, Conrad, 1840, Ann. Rep. N. Y., p. 206, and Pal. N. Y., vol. 3, p. 312, Low. Held, and Oriskany Grs. gibbosum. Hall, 1859, Pal. N. Y., vol. 3, p. 322, Low. Held. Gr. haliotoides, Meek «& Worthen, 1866, Proc. Acad. Na
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