Bulletin of the Museum of Comparative Zodélogy 
AT HARVARD COLLEGE. 
Var. DVL. No. 3. 
GEOLOGICAL SERIES, Vol. X. SHALER MEMORIAL SERIES, No. 2. 
EXPEDITION TO THE BALTIC PROVINCES OF RUSSIA 
AND SCANDINAVIA. 
PART 1.— THE CORRELATION OF THE ORDOVICIAN STRATA 
OF THE BALTIC BASIN WITH THOSE OF EASTERN 
NORTH AMERICA. 
‘ 
By Percy E. RayMonp. 
Wits Eicut Puates. . 
CAMBRIDGE, MASS., U.S. A. 
PRINTED FOR THE MUSEUM. 
‘ Juuy, 1916. 
