PO 



Р1Ч 

 г In. 



Э A 



by 



A. V. IVANOV 



Department of Zoology, University of Leningrad, U.S.S.R. 



Translated from the Russian and Edited by 

 D. B. CARLISLE 



With additional material by 

 EVE С SOUTHWARD 



[uj 



LIBRARY 



MASS 



CONSULTANTS BUREAU 



NEW YORK 

 1963 



