HANDBOOKS for Students and General Readers. 



ZOOLOGY 



OF THE 



INVERTEBRATE ANIMALS 



BY 



ALEX. MACALISTER, M.D. 



Professor of Zoology and Comparative Anatomy in tke 

 University of Dublin. 



Specially Revised for America 



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



Professor of Zoology and Geology in 

 Brown University. 



NEW YORK 



HENRY HOLT AND COMPANY 

 1879. 



