THE CHICAGO ACADEMY OF SCIENCES 
SPECIAL PUBLICATION NO. 3 
THE LYMNAIDZA OF 
NORTH AND MIDDLE AMERICA 
RECENT AND FOSSIL 
By 
FRANK COLLINS BAKER 
CURATOR OF THE CHICAGO ACADEMY OF SCIENCES 

OO MICAGH 
20? Pe, 






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CHICAGO 
Published by the Academy 
February 15, 1911 
