AMERIOAN 8CIENGE SEBIES 



ZOOLOGY 



HIGH SCHOOLS AND COLLEGES 



BY 



A. S. PAOKAED, M.D., Ph.D. 



MEMBER OF THE NATIONAL ACADEMY OP SCIENCES; PROFESSOR OF ZOOLOOT 

 AND GEOLOGY IN BROWN UNIVERSITY 



FIFTH EDITION, REVISED 



NEW YORK 

 HENKY HOLT AND COMPANY 



1886 



