NATURAL SCIENCES OF PHILADELPHIA. 429 



202. Leda (Yoldia) Evansi, Meek & Hayden. 



Nucula Evansi, M. & H., Ap. 1856, Pr. Ac. Nat. Sci. Phila. 84. 

 Leda Evansi, M. & H., May I860, " " " 185. 



203. Leda (Yoldia) ventricosa, Hall & Meek, sp. 



Nucula ventricosa, H. & M., 1854, Mem. Ac. Arts and Sci. Boston, v. N. 

 S. 385, pi. 1, fig. 11. (Non. N. ventricosa, Hind, 1843.*) 



204. Leda (Yoldia) subnasuta, Hall & Meek, sp. 



Nucula subnasuta, H. & M., Mem. Am. Acad. Arts and Sci. Boston, v. 

 N. S. 384, pi. 1, fig. 11. 



NUCULIDiE. 



205. Nucula e q u i 1 a t e r a 1 i s , M. & H., Ap. 1856, Pr. Ac. Nat. Sci. Phil. 84. 



206. Nucula subplana, M. & H., " 



207. Nuculacancellata, M. & H., " 



208. Nucula planimarginata, M. & H., " 



209. Nucula absoletastriat a , M. & H., " 



PECTENIDiE. 



210. Pecten rigid a, Hall & Meek, 1854, Mem. Am. Ac. Sci. and Arts, 



Boston, v. N. S. 381, pi. 2, fig. 4, a, b, c. 



211. Pecten Nebrascen sis, M. & H., Ap. 1856, Pr. Ac. Nat. Sci. Phil. 87. 



ANOMIADiE. 



212. Anomia obliq ua, M. & H., May 1860, Pr. Ac. Nat. Sci. Phila. 181. 



213. Anomia sub trigonatis , M. & H., May 1860, Pr. Ac. Nat. Sci. 



Phila. 181. 



OSTREADiE. 



214. Ostrea in ornata, M. & H., May 1860, Pr. Ac. Nat. Sci. Phila. 181. 



215. Ostrea translucida, Meek & Hayden, (MSS.) 



Ostrea larva, Hall & Meek, (non. Lamarck) 1S54, Mem. Acad. Arts and 

 Sci. Boston, v. N. S. 406. 



216. Ostrea congest a, Conrad, 1843, Nicollet's Report, Explor. N. W. 



Territories, 167. 



217. Ostrea pat in a, M. & H., 1856, Pr. Ac. Nat. Sci. Phila. 277. 



218. Gyphsea vesicularis, Lamarck ? sp. 



Ostrea vesicularis, Lamarck, 1860, Am. Mus. viii. 160, T. 22, fig. 3. 

 Ostrea deltoidea, Lamarck, " " " andxiv. t. 21, pars. 



Ostrea vesicularis of numerous authors. 



BRACHIOPODA? 

 HIPPURITID^. 



219. Caprinella ?coraloidea, Hall & Meek. 1854, Mem. Am. Ac. Arts and 



Sci. Boston, v. N. S. 381, pi. 2, fig. 3. 



* Should Nucula ventricosa of Hinds prove to be a true Leda, it will become neces- 

 sary to give our Nebraska shell a new specific name, in which case we would propose 

 to call it Leda exigua. 



I860.] 30 



