

ZOOLOGY 



By 



CLARENCE J. GOODNIGHT, Ph.D. 



Associate Professor of Zoology, 

 Purdue University, 

 Lafayette, Indiana 



and 



MARIE L GOODNIGHT, M.S. 



Formerly Instructor in Biology, 

 Purdue University, 

 Lafayette, Indiana 



WITH 217 ILLUSTRATIONS 



ST. LOUIS 

 I HE C. V. MOSBY COMPANY 



1954 



