Vol I. Sun — Cambrian Faunas of North China (iv) 59 



Width of occipital ring 1.3 mm. 1.0 mm. 1.0 mm. 1.5 mm. 



Width of frontal border 2.7 mm. 2,3 mm. 2.3 mm. 3.0 mm. 



Horizon and Locality: — Upper Cambrian: from the lowest horizon of the Kao- 

 lishan limestone. Associated with this are Mansuyia orientalis (Grabau) Sun, Kaolishania 

 pustidosa Sun, Syntrophia orthia Walcott etc. (Coll. Y. C. Sun). 



This species is represented by many cranidia and associated pygidia; and is really 

 one of the most common forms of Kao-Li-Shan. 



The Kaohshan specimens differ from the type species in the presence of the median 

 longitudinal ridge, in its distinct palpebral ridge and broader frontal border, longer gla- 

 bella and comparatively narrow fixed cheeks. The course of the facial suture is also 

 different from that in Walcott's specimens, converging slightly on both sides from the 

 frontal margin to the eye, while in our material the facial suture converges rapidly on 

 both sides from the frontal margin to the palpebral lobe. 



This form is characterized by its concave frontal border, truncato-conical glabella, 

 absence of the distinct glabellar furrows, distinct longitudinal median ridge, and palpe- 

 bral ridge ; and the finely pustulose character of the outer shell. 



Genus CHANGIA Sun (Gen. nov.) 

 192.3 Changla Sun, Bulletin of the Geological Society of China, Vol. II, No. 1-2 (listed). 



General form elongate oval, moderately convex. Glabella of cylindrical form con- 

 tracted in the middle by incurving of the sides opposite the palpebral lobe ; marked by three 

 pairs of short, slightly impressed furrows; occipital furrow distinct; occipital ring uniform 

 in width throughout. Dorsal furrow deep broad and round ; frontal furrow broad and deep. 



Fixed cheeks very narrow; palpebral lobe of medium size and elevated; the 

 facial suture cuts the frontal border with convex arc to the anterior part of the palpebra 

 lobe, curves around the lobe and finally extends outward to the margin of the postero- 

 lateral limb. Frontal border slightly convex, very broad, sloping down from the frontal 

 groove in the front of the glabella to the rim of the border; antero-lateral angles rounded. 

 The postero-lateral limb narrow, marked by a broad, shallow groove extending from the 

 dorsal furrow to the extremities of the limb. 



Free cheeks large ending into a strong genal spine which has about the same 

 length as the cheek, body border narrow and depressed ; cheek-body slightly convex, 

 forming a triangular depressed area inside the posterior margin. 



Thorax unknown. 



Pygidium large with a strong central axis that terminates witliin a broad flatten- 

 ed border. Central axis divided by broad, deep and round furrows into six or more 



