NORTH AMERICAN MONOSTOMES 



BY 



EZRA CLARENCF^HARRAH 



A.B. Southwestern Cotte"ge7 1913 

 A. M. University of Illinois, 1919 



THESIS 



SUBMITTED IN PARTIAL FULFILLMENT OF THE REQUIREMENTS FOR 



THE DEGREE OF DOCTOR OF PHILOSOPHY IN ZOOLOGY IN 



THE GRADUATE SCHOOL OF THE UNIVERSITY OF 



ILLINOIS, 1921 



Reprinted from the ILLINOIS BIOLOGICAL MONOGRAPHS, 

 Vol. VII, number 3, pages 219-328 



