PROC. ACAD. NAT. SCI. PHILA. 1915. 



PLATE V. 



1c 



If 



^f) 



3a 



la 



l^St*- 



b 



Id 



^) 



2a 





2d 



% 



3c 



lb 



le 



2b 



3b 



PILSBRY: MOLLUSCA OF THE SOUTHWESTERN STATES. 



