t^iL<l 



Bulletin of the Museum of Comparative Zoology 

 AT HARVARD COLLEGE. 

 Vol. LVL No. 3. 



'GEOLOGICAL SERIES, Vol. X. SHALER MEMORL&L SERIES, No. 2. 



EXPEDITION TO THE BALTIC PROVINCES' 6F RUSSIA 



AND SCANDINAVIA. 



PART 1.— THE CORRELATION OF THE ORDOVICIAN STRATA 



OF THE BALTIC BASIN WITH THOSE OF EASTERN 



NORTH AMERICA. 



By Percy E. Raymond. 



With Eight Plates. 



CAMBRIDGE, MASS., U. S. A. 



PRINTED FOR THE MUSEUM. 



July, 1916. 



A 



