LIBRARY 





CARNEGIE INSTITUTION OF WASHINGTON, PUBLICATION No. 142 



CONTRIBUTIONS FROM ZOOLOGICAL LABORATORY OF THE MUSEUM OF COMPARATIVE 

 ZOOLOGY AT HARVARD COLLEGE. E. L. MARK, DIRECTOR. No. 216. 



Copies of this Book 

 were first issued 



APR 3 191J 



PRESS OF J. B. LIPPINCOTT COMPANY 

 PHILADELPHIA 



