STUDIES ON THE VARIATION, 
DISTRIBUTION, AND EVOLUTION 
OF THE GENUS PARTULA 
THE SPECIES OF THE MARIANA ISLANDS, 
GUAM AND SAIPAN 
By HENRY EDWARD CRAMPTON, Pu. D. 
Associate of the Bishop Museum of Honolulu, 
Research Assoctate of the Carnegie Institution of Washington, 
Professor of Zoology, Barnard College, Columbia University 





PuBLISHED BY THE CARNEGIE INSTITUTION OF WASHINGTON 
Wasuincton, Marcu 1925 
