A TEXTBOOK 

 IN GENERAL ZOOLOGY 



BY 



HENRY R. LINVILLE, Ph.D. 



FORMERLY HEAD OF THE DEPARTMENT OF BIOLOGY, JAMAICA 

 HIGH SCHOOL, NEW YORK CITY 



HENRY A. KELLY, Pd.D. 



DIRECTOR OF THE DEPARTMENT OF BIOLOGY AND NATURE STUDY 

 ETHICAL CULTURE SCHOOL, FIELDSTON, NEW YORK CITY 



AND 



HARLEY J. VAN CLEAVE, Ph.D. 



ASSOCIATE PROFESSOR OF ZOOLOGY, UNIVERSITY OF 

 ILLINOIS, URBANA, ILLINOIS 



GINN AND COMPANY 



BOSTON • NEW YORK • CHICAGO • LONDON 

 ATLANTA • DALLAS • COLUMBUS • SAN FRANCISCO 



