PLATE XXV 



PAGE 



IPigs. 1-4. OSTREA (GRYPHOSTREA) VOMER (Morton) Meek 579 



1. Exterior of left valve. X 2. 



2. Interior of same. X 2. 



Matawan formation, Camp Pox, Chesapeake and Delaware 

 Canal, Delaware. 



3. Interior of right valve. X 2. 



4. Exterior of same. X 2. 



Monmouth formation, Brightseat, Prince George's County. 



Fig. 5. EXOGYRA COSTATA Say 564 



Exterior of left valve. Monmouth formation, Brightseat, Prince 

 George's County. 



921 



