Conchifera. ~ Pinna. 



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



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



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



Renauxtana, d'Orb. (bicarinata), P. F. 252, 330, 4-6. 

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



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



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

 rostriformis, 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, Leym. M. G. S. F. vol. v, pi. 9, f. 9. Fr. N. 



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

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



PINNIGERA, Deluc, 1779. 

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



PLACUNA, Solander, 1785. 

 scabra, Morton (PLACUNANOMIA), Syn. 62. 



PLACUNANOMTA, Brod. 1832. 

 S. Gen. Paranomia, Con. 1860. 



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



Saffordii, Con. id. 290, 46, 21. Tenn. G. 



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



Plagiostoma, Sow. 1814. 



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



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



dumosa, Morton, pars. (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 different 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. 



