Bulletin of the Museum of Comparative Zoology 



AT HARVARD COLLEGE. 

 Vol. LVI. No. 4. 



GEOLOGICAL SERIES, Vol. X. SHALER MEMORIAL SERIES, No. 3. 



EXPEDITION TO THE BALTIC PROVINCES OF RUSSIA 

 AND SCANDINAVIA, 1914. 



PART 2.— THE SILURIAN AND HIGH ORDOVICI.AN STRATA OF 

 ESTHOXIA, RUSSIA AND THEIR FAUNAS. 



PART 3.— AX IXTERPRETATIOX OF THE SILURIAN SECTION 



OF GOTLAXD. 



By W. H. Twenhofel. 



With Five Plates. 



CAMBRIDGE, MASS., U. S. A.: 



PRIXTED FOR THE MUSEUM. 



July, 1916. 



