ILLINOIS BIOLOGICAL 

 MONOGRAPHS 



Vol. VII July 1922 No. 3 



NORTH AMERICAN MONOSTOMES 



PRIMARILY FROM FRESH WATER HOSTS 

 WITH NINE PLATES 



BY 1 



1 



E. C. HARRAH i 



Price $1.25 



Published by the UNivERSiTy or Illinois Press ; 



under the auspices of the graduate school ^ 



Urbana, Illinois | 



