BULLETIN 
OF THE 
ILLINOIS STATE LABORATORY 
OF 
NATURAL HISTORY 
URBANA, ILLINOIS, U. S. A. 
VOL. VIII. FEBRUARY, 191@ ARTICLE IV. 
THE ECOLOGY OF THE SKOKIE MARSH AREA, WITH SPECIAL 
REFERENCE TO THE MOLLUSCA. 
aeeoniat Inger ~ 
os Bi 
JUL 18 ly Av 
Ny, Mi 
“onal MuseY 
BY < 
FRANK COLLINS BAKER 
Curator of the Chicago Academy 
of Sciences 
