Conchifera. 223 Pinna. 



petasunculus, Math. Catal. 180, 27, 3-5. Fr.^ C. 



quadrangularis, Goldf. P. Germ. 167, 127, 8. G , Fr. 0. 



recticostata, d'Orb. Prod. 245. Fr. C. 



Renauxiana, d'Orb. (bicarinata), P. F. 252, 330, 4-G. 

 restituta, Hoen. Goldf. pi. 138, f. 3. G., India. C. 



Robinaldina, d'Orb. P. F. 251, 330, 1-3. Fr. N. 



rugosa, Koem. not Sow. (subrugosa), Nord. Kreid. p. 65. 

 rostriforrais, Morton, Jour. Acad. 1st s. vol. viii, 214, 10, 5. 



N. J. C. 



subrugosa, d'Orb. Prod. 80. G. N. 



subtetragona, d'Orb. Prod. 165. E. U. G. 



sulcifera, Leyra. M. G. S. F. vol. v, pi. 9, f. 9. Fr. N. 



sulcata J Woodw. (decussata), Geol. Norf. pi. 5, f. 23. 

 tetragona, Sow. not Brocchi (subtetragona), M. Con. 313. 



PINNIGERA, Deluc, 1779. 

 magna, d'Orb. Prod. 107. Fr. K 



PLACUNA, Solander, 1785. 

 scabray Morton (Placunanomia), Syn. 62. 



PLACUNANOMIA, Brod. 1832. 



S. Gen. Paranomiay Con. 1860. 



lineata. Con. Jour. Acad. 2d s. vol. iv, 291, 46, 20. Tenn. C, 



SafFordii, Con. id. 290, 46, 21. Tenn. (7. 



scabra, Morton, Sp. (Placuna), Gabb, 1861. N. J. G. 



Plagiostoma, Sow. 1814. 



asjjera, Mant. (Ctenoides), Geol. Suss. 129, 26, 18. 



dumosa, Morton, pars. (Spondylus), Syn. 59, 16, 8. 



dumosa, Morton, ^ars. (S. Mortoni), Syn. 60. Eocene. 



* There is a specimen in the Academy's collection, marked "Louisiana,' 

 corresponding -with the figure and description given of this species. The litbo- 

 logical character of the specimen is diiferent from anything I have heretofore 

 seen in the American Cretaceous, except perhaps that of the Northwest. There 

 may, however, be some mistake in the locality. 



