NORTH-CAROLINA GEOLOGICAL STRYEY. 



293 



V. CRIBRARI CON. 



FIG. 218. 



North-Carolina. 



(Fig. 218.) 



Shell thick, medium size, 

 slightly ventricose, furnished 

 upon the outside by about 

 twenty-five sharp lamelliform 

 concentric and recurved ribs, 

 crenulated upon the umbonal 

 side ; ribbed or ridged trans 

 versely on the ventral side, 

 the ridges extending across 

 to the adjacent rib ; lunule 

 crenulated. 



Recent upon the coast of 



FIG. 219. 



V. LATILTRATA CON. VENTS TAPHIA. LAM. (Fig. 219.) 



Shell sub-trigonal, thick and pon 

 derous for its size ; ribs fine, con 

 centric, and very thick ; irregularly 

 stirate, crenulate upon the lower 

 margin ; umbo slightly flattened. 



This shell is readily known by its 

 thick ribs, and deep subci between 

 them. Common in the miocene of 

 North-Carolina. 



Fro. 220. 



VENUS MELTASTRIATA. (Fig. 220.) 



Shell small, sub-orbicular, striated concentri 

 cally, rather irregular, interruptedly radiated. 



Venus pramagna, cancellata and subnasuta are 

 also rather common fossils of the miocene. 



