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l^^l^ West Coast Shells 



(Revised Edition) 



A DESCRIPTION OF THE PRINCIPAL MARINE MOLLUSKS 



LIVING ON THE WEST COAST OF THE UNITED 



STATES, AND OF THE LAND SHELLS 



OF THE ADJACENT REGION 



By 

 JOSIAH KEEP, A. M.'^ 



^ii 



PROFESSOR OF GEOLOGY 

 MILLS COLLEGE 



Also a Chapter on the Fresh Water Mollusks of the Pacific Slope 



By 

 HAROLD HANNIBAL 



OF STANFORD UNIVERSITY 



Dhfefon of l/folteb: 



FULLY ILLUSTRATE lP^^^^'^' librarv 



SAN FRANCISCO 



^f)t WiUtaktv Sz 3^ap-immin Company 



I g I I 



