168 MYA. GAPER. Class VI 



18. NITENS. Mont. Test. Br. Sup. App. l65. 



* M. "^vith an ovate shell regularly striated con- 

 centrically ; color pink and white ; a single 

 tooth in one valve enters a cleft in the other ; 

 about a quarter of an inch long, and three-^ 

 eighths of an inch broad. 



Near Dunbar ; extremely rare. 



