MOD.] 



LAMELLIBRANCHIA TA. 



491 



orthonota, Conrad, 1839, (Unio orthono- 



tus,) Ann. Rep. N. Y., p. 66, and Geo. 



Rep. 4th Dist. N. Y., pi. 2, figs. 8 and 9, 



Medina sandstone. 

 orthonota, Meek & Worthen, 1868, Geo. 



Sur. 111., vol. 3. This name was preoc- 

 cupied. See M. rectiformis. 

 ovata, Hall, 1852, Pal. N. Y., vol. 2; p. 



101, Clinton Gr. 



parallela, see Orthodesma parallelum. 

 parviuscula, Billings, 1859, Can. Nat. and 



Geo., vol. 4, p. 446, Chazy Gr. 

 perlata, Hall, 1876, 28th Rep. N. Y. Mus. 



Nat. Hist., p. 172, Niagara Gr. 

 perovata, see Modiomorpha perovata. 

 pholadiformis. Hall, 1851, Lake Sup. Land 



Dist., vol. 2, p. 213, Hud. Riv. Gr. 

 plana, Hall, 1861, Geo. Rep. Wis., p. 30, 



Trenton Gr. 

 pogonipensis, Walcott, 1885, Monogr. U.S. 



Geo. Sur., vol. 8, p. 78, Trenton Gr. 

 prisca, Walcott, 1887, Am. Jour. Sci. and 



Arts, 3d ser., vol. 34, p. 191, Up. Ta- 



conic. Not a Modiolopsis. 

 primigenia, Conrad, 1838, (Unio primi- 



genius,) Ann. Rep. N. Y., p. 66, and 



Geo. Rep. 4th Dist. N. Y., pi. 2, fig. 3, 



Medina sandstone, 

 recta, Hall, 1867, 20th Rep. N. Y. Mus. 



Nat, Hist., p. 386, Niagara Gr. 

 rectiformis, Worthen, 1882, Bull. No. 1, 



111. St. Mus. Nat; Hist,, p. 38, Tren- 

 ton Gr. Proposed instead of M. ortho- 

 nota, Meek & Worthen, 1868, Geo. Sur. 



111., vol. 3, p. 295, which was preoc- 

 cupied, 

 rhomboidea, Hall, 1860, Can. Nat. and 



Geo., vol. 5, p. 148, Up. Sil. 

 rudis, Billings, 1874, Pal. Foss., vol. 2, p. 



133, Up. Sil. 

 sinuata, Emmons, 1842, (Cypricardites 



sinuatus,) Geo. Rep. 2d Dist. N. Y., p. 



399, and Pal. N. Y., vol. 1, p. 298, Hud. 



Riv. Gr. 

 striata, Billings, 1866, Catal. Sil. Foss. 



Antic., p. 48, Anticosti Gr. 

 subalata, Hall, 1852, Pal. N. Y., vol. 2, p. 



84, Clinton and Niagara Grs. 

 aubcarinata, Hall, 1852, Pal. N. Y., vol. 



2, p. 601, Clinton Gr. 

 subnasuta, Hall, 1860, Can. Nat. and Geo., 



vol. 5, p. 148, Up. Sil. 

 tubnasuta, Meek & Worthen. See M. can- 



cellata. 

 subrhomboidea, Simpson, 1889, Trans. 



Am. Phil. Soc., p. 450, and Diet. Foss., 



Pa., p. 411, Clinton Gr. 

 subspatulata,' see Cvpricardites subspatu- 



latus. 

 superba, Hall, 1861, Geo. Rep. Wis., p. 



31, Trenton Gr. 

 terminalis, Hall, 1847, Pal. N. Y., vol. 1, 



p. 318, Hud. Riv. Gr. 

 trentonensis, Hall, 1847, Pal. N. Y., vol. 1, 



p. 161, Trenton Gr. 

 truncata. Hall, 1847, Pal. N. Y., vol. 1, p. 



296, Hud. Riv. Gr. 

 undulostriata, Hall, 1852, Pal. N. Y., vol. 



2, p. 284, Niagara Gr. 



unionoides, Meek, 1871, (Anodontopsis 

 unionoides,) Am. Jour. Sci. and Arts, 

 3d ser., vol. 2, p. 299, and Ohio Pal., 

 vol. 1, p. 141, Hud. Riv. Gr. 



varia, Billings, 1874, Pal. Foss., vol. 2, p. 

 56, Low. Held. Gr. 



FIG. 855. Modiolopsis versaillesensis. Left 

 valve. 



versaillesensis, S. A. Miller, 1874, Cin. 

 Quar. Jour. Sci., p. 150, Hud. Riv. Gr. 



FIG. 856. Modiolopsis versaillesensis. Hinge- 

 line aud muscular impression. 



MODIOMORPHA, Hall, 1870, Prelim. Notice 

 Lam. Shells, p. 72. [Ely. contracted from 

 Modiola, a genus ; morphe, form.] Equi- 

 valve, subovate, larger posteriorly, com- 

 pressed ; beaks small ; sinus oblique 

 and constricting the base; surface con- 

 centrically undulated ; single tooth in 

 the left valve, and corresponding socket 

 iu the other ; no lateral teeth ; ligament 

 external. Type M. concentrica. 



affinis, Hall, 1885, Pal. N. Y., vol. 5, p. 

 284, Ham. Gr. 



alta, Conrad, 1841, (Cypricardites alta,) 

 Ann. Rep. N. Y., p. 52, and Pal. N. Y., 

 vol. 5, pi. 37, figs. 1-16, Ham. Gr. 



altiformis, Walcott, 1885, Monogr. U. 8. 

 Geo. Sur., vol. 8, p. 169, Devonian. 



ambigua, Walcott, 1885, Monogr. U. S. 

 Geo. Sur., vol. 8, p. 239, Carboniferous. 



arcuata, Hall, 1884, Pal. N. Y., vol. 5, pi. 

 36, fig. 21, Ham. Gr. 



chemos, Clarke, 1885, Bull. U. S. Geo. 

 Sur., No. 16, p. 30, Genesee shales. 



clarens, Hall, 1885, Pal. N. Y., vol. 5, p. 

 273, Up. Held. Gr. 



complanata, 

 Hall, 1870, 

 Prelim. Notice 

 Lam. Shells, p. 

 73, and Pal. 

 N. Y., vol. 5, 

 p. 272, Up. 

 Held. Gr. 



concentrica, Con- 

 rad, 1838, (Pte- 



rinea concentrica,) Ann. Rep. Geo. Sur. 

 N. Y., p. 116, and Pal. N. Y., vol. 5, pi. 

 34, figs. 9-10, Ham. Gr. 



FIG. 857. Modiomorpha 

 concentrica. 



