214 Dr. H. Woochcard — Trilobites front Shantunc/, JV. China. 



Cambrian age. Matthew/ however, maintains the Middle Cambrian' 

 [p. 106] age of the Chinese Dorypyge, but regards this genus in 

 a larger sense, viz., as including in part Olenoides. In accordance 

 with this view Dorypyge would make its appearance in the Lower 

 Cambrian, attain its acme in the Middle, and extend also into the 

 Upper Cambrian. 



Kecently Bergeron " has described a sandstone and a limestone 

 slab from China, which exhibit remains of a quite peculiar new 

 fauna. The sandstone slab comes from the mountains north of 

 Toung-yen-'Fou, from a neai-ly vertically elevated complex of strata, 

 with horizontally deposited Sinic sandstones overlying them; the 

 slab contained only a few remains of a new genus of Trilobites, 

 Arthricocephalus. Bergeron does not pronounce on the geological 

 age of the stratum ; but from the stratigraphical relations and from the 

 diagrammatic sketch of Arthricocephalus (op. cit., p. 515, text-fig. 9), 

 a Lower Cambrian or even a pre-Cambrian age may be assumed. 



The limestone slab, which had been bought from a dealer in 

 curiosities in Peking, and was said to come from the mountains to 

 the north of that city, is, according to the photographic illustration 

 (op. cit., pi. xiii), completely covered with remains of Trilobites, 

 referred by Bergeron to the genera Agnostus (Regii group), ? Calym- 

 mene, Olenoides, ? Dicellocephalus, and to the new genus Drepanura. 

 From what will be said further on, the correct determination of the 

 Agnostus and Olenoides may be doubted ; it is precisely from thesQ 

 forms that Bergeron concludes the Peking slab to be of Middle 

 Cambrian. Concerning the strata of Liautung, Bergeron is of opinion 

 that they cannot be with certainty referred to the Middle Cambrian ; 

 in his opinion neither is Dorypyge (generically different from 

 Olenoides), nor are Conocephahis, Anomocare, and Liosiraciis charac- 

 teristic of this horizon. Moreover, in his view, the Agnostus (from 

 Sai-ma-ki) is a member of the 'Longifrontes,' which is supposed to 

 have been " trouve a un niveau inferieur a celui des Dorypyge " (from 

 Wu-lo-pu), is suggestive of the Upper Cambrian, where this group 

 is said to reach the maximum of its development. 



[p. 107] Considering these divergent views on the age of the 

 Sinic strata, as well as the imperfect knowledge of their faunas, we 

 are under great obligation to Herr Bergmeister F. Koerfer for 

 having collected, amongst others, numerous slabs from the Upper 

 Sinic Limestones with well-preserved fossils. The collections were 

 handed over to the Royal Prussian Geological Survey and ' Berg- 

 akademie,' by whom Herr H. Monke states he has been entrusted 

 with the examination of the fossils. One particularly well- 

 preserved slab (reproduced on pi. ix) had been presented to 

 Baron v. Richthofen ; this, he says, has also been kindly entrusted 

 to him. The Sinic fossils come from two separate localities. 



^ Studies on Cambrian Faunas: Trans. E. Soc. Canada, ser. ii, vol. iii (1897), 

 p. 186 ; and vol. v (1899), pp. 66, 62. 



2 "Etude de quelques Trilobites de Chine": Bull. Soc. geol. France, ser. iii,, 

 t. 27 (1899), p. 499. 



