NORTH-CAROLINA GEOLOGICAL SURVEY. 



289 



FAMILY CYPRINIDAE. 



Shell regular, equivalve oval or elongated ; valve close, 

 solid ; epidermis thick and dark ; ligament external, conspic 

 uous cardinal teeth 1 3 in each valve ; pedal scars close to 

 or confluent with the adductors ; pallial line simple. Wood 

 ward. 



ASTARTE 



Shell small, thick, compressed, smooth or concentrically 

 furrowed ; lunule impressed ; ligament external ; hinge teeth 

 2 2 ; anterior tooth in the right valve large and thick. 



FIG. 212. 



ASTARTE CONCENTRICA. (Fig. 212.) 



Shell small, thick, triangular, compress 

 ed, concentric ; furrows close and regular 

 unbones acute, recurved ; margin cre- 

 nate. It is about one inch long, and cr.o 

 broad. It is rather common in the mio- 

 cene of North-Carolina. 



ASTARTE UNDULATA. (Fig. 213.) 



The broad, variable and concentric furrows will serve to 

 distinguish it from the foregoing. It is comparatively a 

 broader shell. The Undulata seems, however, to be quite 

 variable, and the figure shows one of the extremes of this 

 species. 



3 CRASSATELLA UNDULATA. (Fig. 214.) 



Shell oblong, ovate, compressed, mark 

 ed upon the outside with coarse concen- 



FIG. 214. 



