288 



NORTH-CAROLINA GEOLOGICAL SURVEY. 

 FIG. 209. 



ilaterai , X 



en/ ^g. 210.) 



FlG - 21 - - J oliell thick, squamose, or 



concentrically laminated and 

 imbricate; lamina striated, sin- 

 istral, crenulated interiorly ; 

 upper valve flat. Figure low 

 er valve natural size. Abun 

 dant in the miocene of North- 

 Carolina, especially on the 

 Cape Fear. 



CHAM A CONGREGATA. 



Shell thick, orbicular, with 

 its surface composed of plates 

 or lamina ; in the flat valve the places are crenulated or plai 

 ted. 



CHAMA STRIATA. N. S. (Fig. 211.) 



fig. 211. Shell small, ovate, rather thick for its size ? 



lower valve distinctly striate. Usually found 

 in the hollow or inside of the univalves. 



