PLATE L. 



PAGIi 



Figs. 1-5. OsTEEA (Gryphaeostrea) vomer (Morton) 193 



1. Exterior of lower valve. Glymont. 

 la. Lateral aspect of the same. 



lb. Interior of the same. 



2, 3. Exteriors of lower valves of young individuals. 



4. Exterior of upper valve, with tyiaical form and sculpture. 



Upper Marlboro. 

 4a. Interior of the same. 



5. Exterior of lower valve, abnormally elongated and shalloAv. 



Clifton Beach. 



Figs. 6, 6a. Gryphaea vesicularis Lamarck 193 



6. Exterior of lower valve. Clifton Beach. 



6a. Exterior of iipper valve of same individual, with lower valve 

 in position. 



■.m 



