SYNOPTIC KEY TO THE 

 PHYLA, CLASSES, AND 

 ORDERS OF ANIMALS 



WITH PARTICULAR REFERENCE TO FRESH-WATER 

 AND TERRESTRIAL FORMS OF THE MOIST 

 TEMPERATE REGION IN NORTH AMERICA 



Compiled by 



W. C. ALLEE 



Zoological Laboratory, University of Chicago 

 Based on a compilation originally made by 



V. E. SHELFORD 



The Vivarium, University of Illinois 



QL ^UNIVERSITY OF CHICAGO PRESS 



qcp m CHICAGO ^ ILLINOIS 



I A 59 



