BULL. MUS. COMP. ZOOL. 
EXPED. TO BALTIC PROVINCES. PLATE 1 
LAKE LADOGA 
GULF OF FINLAND 
ASH 
—_—— IN THE -—-— 
BALTIC PROVINCES OF RUSSIA 
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MODIFIED FROM BASSLER (AFTER SCHM/OT) 
CAMBRIAN 
S/LURIAN 
ORDOVICIAN 
HELIOTYPE ©CO., BOSTON 
