HANDBOOKS for Students and General Readers 



ZOOLOGY 



BY 



ALEX. MACALISTER, M.D. 



Professor of Zoology and Comparative Anatomy in the 

 University of Dublin 



Specially Revised for America 



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



Professor of Zoology and Geology in 

 Brotvit University 



TWO VOLUMES IN ONE 



NEW YORK 



HENRY HOLT AND COMPANY 

 1879 



