PROC. ACAD. NAT. SCI. PHILA. I9i: 



PLATE VIII. 



1c 



4a 



la 



2a 



3b 



lb 



Id 



3a 



3c 



"/4 



7b 



7c 



PILSBRY AND FERRISS: MOLLUSKS OF THE BLACK RANGE, NEW MEXICO. 



