ORDOVICIAN SYSTEM: NAUNGKANGYI STAGE. 



Ill 



Upper Nsungkangyi Fauna. 





Horizon and Distribution of Species or 

 Nearest Ally. 





Nearest Allies. 



B a 1 t i c 

 Provinc e s 

 Russia. 



Sweden. 



Great Bri- 

 tain. 



Bohemia. 



N. America. 



Remarks. 





Ag 



•• 



•• 









r Mesotrypa discoidea 

 \ Ulrich. 



j Mesotrypa quebecen- 



M ( A TT>1 



r 



| Leptcena repanda 

 i Salter. 



1 Pi. segmentum Ang. 

 L v ar. cornida Dav. 

 Pi. geometrica Kut. 





• • 







Lc 

 Cc 





To 





Ly-Lw 







Cc, Niti Pass. 



R. Colbii Portl. 







Cc 









[ pliomerops canaden- 

 | sis Billings, 

 i Pliomera Fischer i 

 i , Eichw, 



{ Cheirurus mitis 

 L Salter. 

 £. Hubneri Schmidt 



Ag 

 Lo 









Ag 

 •• 



Cc, Niti Pass. 



