EXPED. TO BALTIC PROVINCES. PLATE 1 
BULL. MUS. COMP. ZOOL. 
LAKE LADOGA 
GULF OF FINLAND 
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IN THE —— 
BALTIC PROVINCES OF RUSSIA 
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HP 
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teeny tite 
MODIFIED FROM BASSLER (AFTER SCHM/0T) 
GULF OF R/GA 
S/LURIAN 
ORDOVICIAN 
CAMBRIAN 
