Vol. I. C. C. Yu — Ordovician Cephalopoda of Central Chinz (ii) 17 



same geological horizon as those beds from the neighbourhood of I-chang 

 which bear the fossils such as Orthoceras chinense Foord, Discoceras eurasia- 

 ticum Freeh etc. 



Endoceras duplex Wahlenberg. 



b. Mr, K. Weimann Hsvi also obtained some cephalopods' from the Lunshan 

 limestone in the year 1924. According to Prof. Grabau's determination 

 they are the same as the Lower Ordovician forms characteristic of the Pei- 

 lingtze formation and YehU limestone as follows : 



Proterocameroceras mathieui Grabau 

 Suecoceras attenuaium Grabau 



6. In Chekiang. 



Messrs. C. C. Liu and Y. T. Chao^ had found the following form existing in 

 a bed of purple calcareous shale with limestone-lenses at the top layer of the 

 Yenwashan formation of Middle Ordovician. 



Orthoceras chinense Foord. 



7. In Hupkh Pkovince 



Many collections of fossils were made by geologists, of which the cephalopods 

 are the only ones concerning us here. 



a. Freeh considered the following cephalopods from western Hupeh3 as refer- 

 able to an Upper Ordovician fauna. However, they are now known to be 

 of Middle Ordovician age. 



Orthoceras chinense Foord 



Cyrtoceras {Meloceras) cf. ellipticum Lossen 



Lituites (Ancistroceras) angelini Boll. 



Discoceras verbecki Freeh. 



Discoceras eurasiaticum Freeh. 



b. The following forms form Pan-tse-ya, Hu-hsi, Hsing-shan-hsien had been 

 gathered by Noda* in a brownish marly limestone, which is thought to be the 

 so-called Neiehiashan formation. 



1. See "Science". Science Society of China, Vol. X, No. 4, p. 452. The forms in Mr. Hsii's 

 collection are entirely distinct from those found by Richthofen. The relationship between these beds, 

 which yield the different forms fossils at these two collections, is quite unknown. In this respect 

 further researches in that locality would be necessary for settling this question. 



2. C. C. Liu and Y. T. Chao : Geology of south-western Chekiang. Bulletin of the Geolo- 

 gical Survey of China, No. 9. 



3. Freeh : In Richthofen's China, Vol. V. pp. 4-10. 



4. In Yabe and Hayasaka's Palseontology of Southern China, p. 36. 



