} ■ 7 ■ -. ' -^ 



ILLINOIS BIOLOGICAL 

 MONOGRAPHS 



Vol. VII April, 1922 No. 2 



THE MOLLUSCAN FAUNA OF THE BIG 1 



VERMILION RIVER, ILLINOIS \ 



With Special Reference to its Modification as the Result of 

 Pollution by Sewage and Manufacturing Wastes 



WITH FIFTEEN PLATES 



BY 



FRANK COLLINS BAKER 



Price $1.25 



PuBLisHKD BY THE University OF Illinois Press \ 



under the auspices of the graduate school \ 



Urbana, Illinois | 



