NOKTH-CAROLINA GEOLOGICAL SURVEY. 

 FIG. 209. 



C1U 



FIG. 210. 



Pig. 210.) 



o'he'll 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. 



OHAMA CONGEEGATA. 



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. 



