7 c 



w 

 ZOOLOGY 





A. M. WINCHESTER, PH.D. 



Professor and Chairman of the Biology Department 

 Stetson University, DeLand, Florida 



AND 



HARVEY B. LOVELL, PH.D. 



Professor of Biology, University of Louisville 

 Louisville, Kentucky 



SECOND EDITION 



D. VAN NOSTRAND COMPANY, INC. 



TORONTO NEW YORK LONDON 



