(iv) (i Palxontnlogia Sinica '^''''^ ^• 



into the region where the Upper Caml^rian fauna still persisted. These beds are probably 

 to be regarded as still Cambrian rather than the Lower Ordovician. Nevertheless, tliis 

 zone should be separated h'oni the Chaumitien limestone. 



In the Tai-An ^ ^ district, we discovered four horizons in Kao-Li-Shan, i^ M ill 

 2 li from the city. Several new genera and species were found in this formation. The 

 fauna is closely related to the Geratopyge beds of Sweden, but it is quite distinct from the 

 Chaumitien fauna. All fossils were obtained from the high beds and belong to the upper- 

 most part of the Upper Cambrian, while the lower part is unfossiliferous, probably repre- 

 senting a part of the Chaumitien limestone. 



A large number of well preserved specimens of Dre[>aimra and Damesella were 

 obtained from Ta-Wen-Kou, :fe it □, 5''» li S. of Tai-An. 



In the autumn of 1923, the author revisited the Kaiping Basin with two classes of 

 the Geological Institute of the National University; and we made an extensive collection 

 of Middle and Lower Cambrian fossils. 



Dr. F. F. Mathieu, geologist of the Kailan Mining Administration, kindly sent 

 me the Cambrian material which he had collected at Lei-Chuang ^ ffi and also joined 

 us in the field at Chao-Kou-Chuang i5 ^ ffi. 



More recently Messrs. Y. T. Chao and C. C. Tien, graduates in Palaeontology 

 from the National University, and now members of the Survey staff, obtained a large 

 number of well preserved specimens of Cambrian fossils from the Kushan beds in 

 Lincheng Wa M in southern Chihli, and they recognized also the Manto shale and 

 Changhia limestone in that region, but did not find any fossil in it. The horizon found 

 by them is the BlacJcw elder la zone whjch is essentially of Kushan age, and lies discon- 

 formably below the Lower Ordovician. They also found a no^v genus of the oi'der 

 Proparia characterized by having long genal spines on the fixed cheeks. 



The present contribution covers the material so far obtained from North China, 

 but it does not exhaust the field. ;V second contribution will be issued after further 

 extensive collections have been made. 



Eight new Genera and subgenera, and forty one ne\v species are described in this 

 paper. 



In conclusion, I wish to express my thanks to Mr. K. C. Liu for making tlie 

 drawings; to Dean C. Ho for his kindness in arranging the university excursions, and 

 to Drs. W. H. Wong and H. T. Chang for suggestions and criticisms. Finally I am 

 under great obligations to Prof. Grabau who has put the material in my hands for study, 

 and given many suggestions and directions. 



