192 



PROCEEDINGS OF 



Univalves, 

 Crcpidida fornicata, Say. 

 Crepidula ungui/ormis, Lam. 

 Cryptostoma perspectiva, Say. 

 Fulgur carica. 



Bivalves. 

 Anomia epkippium, Lam. 

 Area ponderosa. Say. 

 Area transversa, Say. 

 Amphidesma aquale, Say. 

 Ampkidesma bellastriata, Conrad. 

 Artemis conecntrica. 

 Cumingia tcllinoides, Conrad. 

 Cytherea Say ana, Conrad. 

 Cardium magnum, Horn. 

 Cardium isoeardia. Lam. 

 Gnatkodon cuneatus. Gray. 

 Lutrnria cannliculata. Say. 

 Mactra lateralis. Say. 



Univalves . 

 Oliva lilterata. Lam. 

 Tcrehra dislocata. 

 Vermetus lumhricalis. 



Bivalves. 

 Nucula limatula. Say. 

 Nucula proxima. Say. 

 Nucula acuta, Conrad. 

 PJtolas cnstata. Lam. 

 Pecten dislocatus. Say. 

 Solecurius carilxcus. Lam. 

 Solcn ensis. Lam. 

 Tcllina alternata. Say. 

 Tcllina lintea, Conrad. 

 Tellina lusoria. Say. 

 Venus permagna, Conrad. 

 Venus cancellata. 



I have alluded in this essay to the fact tliat the eocene and mioccnc arc not con- 

 nected by a single species common to both. It is equally remarkable that very few 

 arc common to the miocene and the newer deposits, and they, witli one exception, 

 are recent species. Tho conclusions derived from my investigations are, that the 

 American tcrtiaries aro of the eras of the eocene, miocene, and post-plioceno, and 

 that the newer pliocene is cither wanting, or lias not yet been observed. 



In concluding this brief sketch of a portion of the tcrli;iry region, I will take 

 occasion to remark, that it b my intention when I have fulfilled my obligations to 

 the State of New- York, in publishing the organic remains in connection with its 

 geological survey, to investigate the Atlantic tcrtiaries more thoroughly, and to sub- 

 mit the results of my labors to the National Institution. In the mean time, gentle- 

 men who reside within the limits of that extensive district would contribute greatly 

 to the advance of American geology, if they would send to the National Institu- 

 tion specimens, in good condition, of all tho various organic romauis on their 

 plantations. 



DESCRIPTIONS OF NEW TERTIARY FOSSILS. 



LOWER TERTIAUV OR EOCENE FOSSILS, 



OSTREA.— (/.in.) 



Oslrca sellatj'ormis, pi. 1, fig. 1. — This singular oyster, the liistory of which I 



have brL'tly given, rijipcarcd so important, in n jrcological point of view, that I iiavc 



here introduced a figure of thu iiptcies, allliough it had bccji imhlislicd, in 1832, in 



,ny "FoskH SIicUb of the Tertiary ForniatioUB," page 27, pi. 13, fip. 1. L'. Tlic 



