NATURAL SCIENCES OF PHILADELPHIA. 585 



The strongly plated columella is the principal character which distinguishes 

 this species from Oliva litterata, Lam. 



PERIPLOMA. 



P. alta. Suborbicular, subequilateral, anterior side subrostated, end trun- 

 cated, direct; basal .margin profoundly rounded medially and posteriorly; 

 anteriorly obliquely truncated or very slightly emarginate. 



Locality. Shiloh, Cumberland Co., N. J. 



A much larger species than P. (Anatina) papyracea, Say, but closely allied. 



SILIQUARIA, Schum. 



S. CarolinensU. Oblong, ventricose, inequilateral, disks slightly contracted; 

 2 cardinal teeth in the right valve, 3 in the opposite ; sinus of pallial impres- 

 sion profound, extending beyond the line of the apex. 



Locality. Wilmington, N. C. 



Closely related to S. gibba, but distinguished by the three cardinal teeth in 

 the left valve, and the more profound pallial sinus. There is a tubercle on the 

 anterior end of the nympha in each valve in the only specimen 1 have seen. 



SAXICAVA, Bellevue. 



S. myirformis. Ovate, thin and fragile, inequilateral ; extremities rounded ; 

 surface marked with fine rugose concentric lines ; cardinal teeth small, two 

 in the right valve. 



Locality. Shiloh, Cumberland Co., N. J. 



MACTRA, Lin. 



M. medialis. Subtriangular, ventricose, elongated ; beaks submedial, not 

 oblique; posterior extremity truncated; posterior basal margin straight; 

 lateral teeth striated. 



EULOXA, Conrad. 



Subtriangular, posteriorly sulcated ; cardinal teeth three in the left valve, 

 the two posterior teeth oblique; two teeth in the right valve, the posterior 

 one oblique ; sinus of pallial impression truncated or slightly emarginate 

 posteriorly. 



E. ( Venus) latisulcata, C. 



CARDITAMERA, Conrad. 



C aculeata. Trapezoidal ; umbonal slope inflated ; base emarginate ; ribs 

 on anterior side crenulated, on the anterior side subspinose. 

 Locality. Shiloh, Cumberland Co., N. J. 



ASTARTID^E. 



ASTARTE, Sowerby. 



A. bella. Triangular, compressed ; marked by very regular closely-arranged 

 fine concentric lines. 



A. concentrica, Tuomey and Holmes (not Conrad), Plioc. Foss. S. C. 71, 20, 

 3. Emmons, Geol. N. C. 289, 212. 

 Ijocality. Virginia. 



Differs from concentrica in being proportionally shorter, and in its much finer 

 and more regular lines. 



.4. Virginica. Suborbicular, inequilateral, convex ; margins rounded ; sur- 

 face with concentric grooves above ; lower half of the valves concentrically 

 striated. 



Locality. Eastern Virginia. 



1862.] " 



