peak nd ana gee 
I = 
Tue Cuicaco Acabemy OF SCIENCES pL 
THE MOoLLUSCA OF THE CHICAGO AREA 
THe PELECYPODA 
FRANK COLLINS BAKER 
CURATOR OF THE CHICAGO ACADEMY OF SCIENCES 
BULLETIN No. III. 
PART I. 
OF 
THE NATURAL HISTORY SURVEY 
ISSUED SEPTEMBER 1, 1898 
pr. 
