AMERICAN SCIENCE SERIES—ADVANCED COURSE 
ZOOLOGY 
FOR 
HIGH SCHOOLS AND COLLEGES 
BY 
A. §. PACKARD, M.D., Pu.D. 
MEMBER OF THE NATIONAL ACADEMY OF SCIENCES; PROFESSOR OF ZOOLOGY 
AND GEOLOGY IN BROWN UNIVERSITY 
NINTH EDITION, REVISED 
NEW YORK 
HENRY HOLT AND COMPANY 
1895 
