AMERICAN SCIENCE SERIES 



ZOOLOGY 



FOR 



HIGH SCHOOLS AND COLLEGES 



BY 



A. S. PACKARD, JR., M.D., PH.D. 



MKMJ1KK OP TIIK NATIONAL ACADEMY OP SCIENCES ; PROFESSOR OP ZOOLOGY 

 AND GEOLOGY IN BROWN UNIVERSITY. 



SECOND EDITION, REVISED 



L IlUt All Y 



UNI', J|| i TV 



NEW YORK 

 HENRY HOLT AND COMPANY 



1880 



