BULLETIN 
OF THE 
ILLINOIS STATE LABORATORY 
OF 
NATURAL HISTORY 
UrBANA, ILuinois, U. S. A. 
Vor. VIII. —————— ARTICLE IV. 
THE ECOLOGY OF THE SKOKIE MARSH AREA, WITH SPECIAL 
REFERENCE TO THE MOLLUSCA. 
lay Vz 
FRANK COLLINS BAKER 
Curator of the Chicago Academy 
‘of Sciences 
