132 PAJLaSOKTOLOGY OF NEW JERSEY. 



CARDIID^. 



Genus CARDIUM Linn. 



Cardlum Eufauleusis. 

 Plate XX, Figs. 17-19. 



Cardium Eufaulensis Conrad. J. A. IST. S., Phil., 2d series, Yol. lY, p. 282, PI. LXYI, 

 Fig. 12. Gabb, Synop. Cret. Form., p. 106. Meek, Check-list Smith. Inst., 

 p. 12. 



0. (Trachycardium) JEufaulensis Meek. Geol. Eept. New Jersey, 1868, p. 726. 



Gabb, P. A. Nat. Sci., Phil., 1876, p. 310. 



Acanthocardium JEufaulensis (Conrad) Stoliczka. Pal. Indica, p. 215. 



Shell of rather niore than niedium size when fully grown, very ventri- 

 cose in profile and obliquely broad-ovate in outline, with a decided straight- 

 ening of the posterior margin. Beaks large, prominent, and incurved. 

 Surface marked by about forty strong, 'rounded, closely-arranged, radiating 

 ribs, which have a rather decided posterior curvature in their direction 

 toward the margin, and increase pretty uniformly in size and strength from 

 the anterior to the posterior of the shell. 



On an internal cast which I have referred to this species the cardinal 

 teeth have been strong and very prominent; the antero- laterals have been 

 moderately developed, but the postero-laterals do not seem to have been 

 strongly marked. 



The specimens examined from New Jersey are either casts or par- 

 tially exfoliated, so that the surface features are not definitely known. The 

 species has been variously referred to different sections of the genus, but 

 the specimens which I have seen will not afford the means of determin- 

 ing its position. 



Formation and locality. — In coarse dark-colored marls of the Lower Bed 

 near Holmdel, New Jersey. Collected by Rev. Dr. Riley. 



Cardium Ripleyanum. 

 Plate XX, Fig. 14. 



Cardium Ripleyanum Conrad. Am. Jour. Conch., Yol. Y, p. 96, PL IX, Fig. 6. 

 Not Cardium Bipleyense Conrad. Jour. A. N. Sci., Yol. Ill, new series, p. 326. 



Mr. Conrad's description of this species is as follows: ^'Suborbicular, 

 equilateral, ventricose; ribs 21, broad anteriorly, narrow posteriorly; inter- 



