THE LARGER PAUNAL HORIZONS. 



55 



Hyslerolenus sp. (038) 



Hysierolenus ? (56) 



Illcenurus canens (034, 38, 54) 



Illcenurus ceres (038) 

 Illcenurus dictys (Cs6) 

 lUcenurus sp. undt. (C 54) 



The fauna of the upper portion of the Ch'au-mi-tien limestone is best 

 represented from 50 to 75 feet (15 to 23 m.) below the summit of the lime- 

 stone. It contains a characteristic grouping of genera and species, as follows : 



Obolus 

 Eoorthis doris (64) 

 Eoorthis kayseri(C6, C68, 74) 

 Eoorthis linnarssoni (64) 

 Huenella oriental is (64) 

 Syntropln'a orthia (064) 

 Billingsella pumpellyi (C 36) 

 Pelagiella clytia (47) 

 Hyolithes daphnis (64) 



Orthotheca cyrene (047, 64) 

 Coosia ? bianos (064) 

 Anomocare sp. (64) 

 Anomocarella bauds (036) 

 A nomocarella .<* sp. undt. (C68) 

 Ptychaspis acamus (45) 

 Plycliaspis baubo (64) 

 Ptychaspis bella (C 74) 

 Ptychaspis cacus (064) 



Ptychaspis callisto (64) 

 Ptychaspis calyce (64) 

 Ptychaspis celo (C 45, C 64) 

 Ptychaspis sp. undt. (64) 

 Ptychaspis sp. (47, 50) 

 Chuangia batia (064) 

 Chuangia nais (64) 

 Solenopleura beroe (064) 

 IlliTniints sp. undt. (45) 



The stratigraphic range of the genera of the Upper Cambrian in China is 

 shown by the following table. Of the 27 genera in the table all occur in the 

 Cambrian of North America, with the possible exception of Chuangia. 



The Upper Cambrian fauna of China is characterized by genera that are 

 well developed in the same fauna in North America. The genus Ptychaspis 

 is particularly prominent in species and numbers in the Upper Cambrian 

 both in China and America. lUccnunis is represented by four species in the 

 central portion of the Ch'au-mi-tien limestone and one at the upper horizon. 

 In America it is found in the limestones referred to the Upper Cambrian 

 where it has a considerable vertical range 1 and wide geographic distribution. 



'Walcott, 1908?, pp. 175, 177, 192, 204, 205. 



