PLATE XXIX 



PAGE 



Fig. 1. GRYPH^EA (PYCNODONTE) VESICULAKIS (Lamarck) Race A 575 



Interior of right valve. Matawan formation, Post 198-199, Chesapeake 

 and Delaware Canal, Delaware. 



Figs. 2, 3. GBYPH^EA (PYCNODONTE) VESICULABIS (Lamarck) Race B 576 



2. Interior of right valve. 



3. Interior of left valve of same individual. 



Matawan formation, Camp Fox, Chesapeake and Delaware 

 Canal, Delaware. 



925 



