PROC. ACAD. NAT. SCI. PHILA., 1919 



PLATE X. 









m 





V 



" )»^"s 



4- M^ 



# 



£i?^-.. 



M^^ 



-% 





V *,.jar¥-^- 





*;jM*i 



.^V -;, 



..3»^^.\ 



5>-^ 



lb 





^ 



3b 



^b 



«s«'?»rl 



.* 



3b 



BERRY: MOLLUSC A OF GLACIER NATIONAL PARK. 



