ORDOVICIAN SYSTEM: NAUNGKANGYI STAGE. JQI 



Lower Naungkangyi Fauna. 



Lo = Llandeilo = Echinosphaerites beds, jRws.s;'a==Etage D2, D3, Bohemia. 

 Ag — Arenig = Vaginaten limestone, Russia = Orthoceras limestone, Sweden = Chazy Group, 

 N. America. 



Sil=Silurian ; Ord. = Ordovician. 



U. = Upper ; M. = Middle ; L. - Lower. 





Horizon and 



Distribution of Species or 

 Nearest Ally. 





Nearest Allies. 



Baltic 

 Provinc e s 

 Russia. 



Sweden. 



Great Bri- 

 tain. 



Bohemia. 



N. America. 



Remarks. 



A. bohemicus Barr. . 











Cc 







( H. balticus Eichw. . 



L.Lo 















' H. aranea Schloth . 



L.Lo 















fH. Helmhackeri Barr. 

 I H. Rouvillei v. Keen. 











Co 





Cc, S. France. 



C H. confortatus Barr. 











Cc 







j H. granatum Wah- 

 L lenb. 





Ag 













C. ellifticus Millor 

 and Gurley. 













Wk 





