Vol. I. C. C. Yu — Ordovician Cephalopoda of Central China (ii) 19 



10. In webteen- Yunnan 



Middle Ordovician fossils have been obtained in three localities i.e. Pu-piao, La- 

 meng and Shih-tien, of which the last named has furnished the largest 

 number of species of cephalopods (ident. by Cowper-Reed'). 



a. Pu-piao 



Orthoceras sp. 



b. La-meng 



Orthoceras sp. 



c. Shih-tien 



Endoceras wahlenbergi Foord 

 Endoceras cf. cancellatum Eichw. 

 Endoceras aff. reinhardi Boll. 

 Orthoceras regulare Schl. 

 Orthoceras cf. kinnekullense Foord. 

 Orthoceras cf. scabrium Ang. 

 0. {Protocycloceras ?) deprati Reed. 

 Actinoceras cf. bigsbyi Brown 

 Jovellania sp. 

 Cameroceras ? sp. 

 Cyrtoceras sp. 

 Spyroceras ? sp. 

 Trocholites yunnanensis Reed 

 T. aff. macromphalus Schrod 

 Lituites sp. 

 Tarphyceras ? sp. 



According to Reed the fossiliferous beds at Shih-tien is probably equivalent to the 

 "Vaginatenkalk" of the Baltic province, but may represent the "Echinosphneritenkalk" 

 of Scandinavia and of the Baltic province of Russia. 



So far as these cephalopods listed above are concerned, we can immediately re- 

 cognize the following facts: (i) in the Middle Ordovician the Actinocers, which is very 

 characteristic and abundant in North China, is very rare in Central as well as South 



I. Reed: Ordovician and Silurian Fossils from Yun-nan. Palseontologia Indica, N. S., vol. 

 VI. No. 3, pp. 62-64. 



