. North American geology and palaeontology for the use of amateurs, students, and scientists [microform]. Paleontology; Paleontology; Geology; Paléontologie; Paléontologie; Géologie. Fio. H72.—Nyassa arguta. Interior of right valve. parva, Walcott, 1885, Monogr. U. S. Geo. Sur., vol. 8, p. 173, Devonian. recta. Hall, 1870, Prelim. Notice Lam. Shells, p. 29, and Pal. N. Y., vol. 5, pi. 63. figs. 1-8, Ham. Gr. Buhalata, Hall, 1870, Prelim. Notice Lam. Shells, p. 29, and Pal. N. Y., vol. 5, pi. 53, figs. 21-26, Ham. Gr. Ophlhoptera, Meek. Not defined. OuTiioDESMA, Hall & Whitfield, 1875, Ohio
. North American geology and palaeontology for the use of amateurs, students, and scientists [microform]. Paleontology; Paleontology; Geology; Paléontologie; Paléontologie; Géologie. Fio. H72.—Nyassa arguta. Interior of right valve. parva, Walcott, 1885, Monogr. U. S. Geo. Sur., vol. 8, p. 173, Devonian. recta. Hall, 1870, Prelim. Notice Lam. Shells, p. 29, and Pal. N. Y., vol. 5, pi. 63. figs. 1-8, Ham. Gr. Buhalata, Hall, 1870, Prelim. Notice Lam. Shells, p. 29, and Pal. N. Y., vol. 5, pi. 53, figs. 21-26, Ham. Gr. Ophlhoptera, Meek. Not defined. OuTiioDESMA, Hall & Whitfield, 1875, Ohio Pal., , p. 93. [Ely. or</ios, straight; desma, a ligament.] Elongated, ventri- cose; cardinal line straight posterior to the beaks, and contracted anterior; ligament external; posterior scar elon- gHte, anterior smaller ; pallial line sim- ple ; surface concentrically lined. Type 0. rt'Ctnm. byruesi, S. A. Miller, 1881, Jour. Cin. Soc. Nat. Hist., vol. 4, p. 76, Hud. Riv. Gr. contractum. Hall, 1847, (Orthonota con- tracta.) Pal. N. Y., vol. 1, p. 300, Hud. Riv. Gr. ouneiforme, S. A. Miller, 1880, Jour. Cin. Soc. Nat. Hist., vol. 3, p. 314, Hud. Riv. Gr. curvatum, Hall & Whitfield, 1875, Ohio Pal., vol. 2, p. 95, Hud. Riv. Gr. faberi, n. sp. Shell large, posterior part of the cardinal line very slightly ele- vated, and anterior part contracted in front of the beaks; anterior end rounded, posterior end more abrupt; basal line contracted in the central Eart by an undefined cincture arising elow the umbones; beaks anterior, obtuse; umbones low and poorly de- fined ; shell unusually high and thin for species in this genus; surface con- centrically furrowed. This Fpecifs bears some resemblance to a Modiolopsis, but it is doubtless an Orthodesma. Col- lected by Mr. Charles Faber in the upper part of the Hud. Riv. Gr., at Versailles, Fig. 873.—Orthodesma fnbeil. mickelboroughi, Whitfield, 1878, Jour. Cin. Soc. Nat. Hist., vol. 1, p. 139, Hud. Riv. Gr. occi
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