U. S. NATIONAL MUSEUM 



BULLETIN 181 PLATE 29 



yi^fe^v " ^ 



10 



13 



16 



^ 





14 



17 



12 



# 

 15 



18 



23 



Cyclophorid Mollusks of America. 



FOR EXPLANATiON OF PLATE SEE PAGE 289. 



