PROC. ACAD. NAT. SCI. PHILA. 1921. 



PLATE XXXVII. 



la 



f m^ 



2 



^»;i^ 



I 



f 



2a 



lb 



f 



2b 



^i 



3b 



3a 



% 



^^v 



^J 



5a 



■!A 



^ 



4a 



PILSBRY: GABB'S TERTIARY MOLLUSC A OF SANTO DOMINGO. 



