A TEXT-BOOK 



IN 



GENERAL ZOOLOGY 



BY 



HENRY R. LINVILLE, PH.D. 



HEAD OF THE DEPARTMENT OF BIOLOGY, DE WITT CLINTON 

 HIGH SCHOOL, NEW YORK CITY 



HENRY A. KELLY, Pn.D. 



DIRECTOR OF THE DEPARTMENT OF BIOLOGY AND NATURE STUDY 

 ETHICAL CULTURE SCHOOL, NEW YORK CITY 



Two Hundred Thirty-Three Illustrations 



GINN & COMPANY 



BOSTON NEW YORK CHICAGO LONDON 



