ON MOLLUSCA OP THE WEST COAST OP NORTH AMERICA. 323 



oo 

 M 



■3 a a 



S C u 



§3 



a 



^■2 



^ a 



W W W M m M 



2 "3 ' 



00 -g 



n, tao 

 a a 



2| g 



p1 s 



it 



a 3 

 a-- 



a s 



a S S 



3-3 



gj o s g -^ t 







•go 



s t 

 ^3 



2 3 



-jJOT a ■ _, 



y 2 



