STATE OF ILLINOIS 

 DEPARTMENT OF REGISTRATION AND EDUCATION 



DIVISION OF THE 

 . NATURAL HISTORY SURVEY 



STEPHEN A. FORBES. Chief 



Vol. XV. 



BULLETIN 



Article V. 



Changes in the Small Bottom Fauna of Peoria 

 Lake, 1920 to 1922 



BY 



ROBERT E. RICHARDSON 



PRINTED BY AUTHORITY OF THE STATE OF ILLINOIS 



URBANA, ILLINOS 

 August, 1925 



