302 NORTH-CAROLINA GEOLOGICAL SURVEY. 



but it is more elongated, and its crenulations appear to differ. 

 I have obtained only one specimen ; and hence, cannot speak 

 of the permanence of its characters. It occurs in Walker s 

 Bluff, on the Cape Fear. 



Cardium sublineatum is a common fossil of the Cape Fear 

 and Neuse marl beds. 



FAMILY CARDITIDAE. CARDITA ARATA. (Fig. 234:.) 



FlG - 234 - Shell rather thick, oblong, 



and ornamented with fifteen or 

 sixteen elevated scaly ribs ; an 

 terior side very short; poste 

 rior margin oblique; inner 

 margin crenate. 



. c. PERPLANA. (Fig. 235.) 



Shell small, rather thick, triangular, inequilateral, radiately 

 ribbed, striated ; posterior side produced, anterior short. 

 Common. 



FIG. 236. A. 



FIG. 235. 



FIG. 236. 



C. ABBREVIATA. (Fig. 236.) 



Shell small, thick, triangular, oblique; ribs strong and 

 crenate ; umbones acute. Common. 



CARPITA TRIDENTATA. (Fig. 236. A.) 



Shell round, triangular, thick; ribs strong and crenulate ; 

 beaks turned forward ; valves with two teeth in the left, and 

 one in the right valve. 



CARDITA CARINATA. 



Shell small, thick, wide on the abdominal side ; ribs strong 

 and radiating ; muricated ; anterior side short. 



