78 



Bulletin 9 



370 



Explanation of Platk 2. 



(8) 



Pag-e. 



Ostrea conipressirostra Say 37 , 339 



Exterior of a large and perfedl left valve as 

 figured in U. S. Geol. Surv. Rep't, 1883, pi. 

 65. Electrotyped for the present work by 

 Joyce Eng. Co., Washington, D. C. 



