G}tc^ Su-ruo 



**A 



STATE OF ILLINOIS 



WILLIAM G. STRATTON, Governor 



DEPARTMENT OF REGISTRATION AND EDUCATION 



VERA M. BINKS, Director 



WISCONSINAN MOLLUSCAN 

 FAUNAS OF THE 

 ILLINOIS VALLEY REGION 



A. Byron Leonard 

 John C. Frye 



ILLINOIS GEOLOGICAL 



SURVEY ' IBRARY 

 R 1986 



DIVISION OF THE 



ILLINOIS STATE GEOLOGICAL SURVEY 



JOHN C. FRYE, Chief URBANA 



CIRCULAR 304 



1960 



