(iv) 50 Palxontologia Sinica Ser. B. 



sides nearly parallel, contracting slightly at the middle, by incurving of the sides. Pleu- 

 ral lobe gently convex, also segmented by furrows. The postero-lateral and posterior 

 margins flat and broad ; lateral spines broad. 



Width 5 mm. Length 4.4 mm. 



Horizon and Locality:— Middle Cambrian: from Changhia limestone of Cheng- 

 shan, 8 li from Choa-Kou-Chuang, Chihli. Collected by University Excursion. 



Genus ManSUYIA Sun (gen. nov.) 



This genus differs from Orepicephalns in having very narrow fixed cheeks, in 

 the absence of the palpebral ridge, ic having very deep distinct dorsal furrows and in the 

 short oblong form of the glabella. 



The general form of the cranidium suggest Anomocare and Anomocarella, but the 

 pygidium of this genus serves to distinguish it. 



The associated pygidia of this genus are of the type of Ceratopyge, but the present 

 genus differs greatly from that one in the cranidium. 



Genotype: Mansuyia orientalis (Grabau) Sun. 



This genus is characterized by its short oblong glabella, narrow fixed cheeks, and 

 absence of the palpebral ridge. The pygidium has two inward-curving slender lateral 

 spines which spring out from the second segment of the pleural lobe of the pygidium. 



Mansuyia orientalis (Grabau) Sun 



Plate III, Jigs. 7 a-j. 



1922 Ceratopyge orientalis Giahsiu. (Mas.) . 



1923 Ceratopyge orientalis Sun. Upper Cambrian of Kaiping Basin. Bulletin of the Geological So- 

 ciety of China Vol. II, No. 1-2, p. 98. (listed). 



This species is represented by many cranidia and the associated pygidia. 



Glabella moderately convex, oblong in form, the front part slightly rounded ; 

 marked by three pairs of shallow broad short pits slightly impressed; occipital furrow 

 rounded, and distinct; occipital ring uniform in width thro^ghout, dorsal furrows and 

 frontal furrow in the front of the glabella deep and clearly defined; frontal limb narrow 

 slightly convex and elevated, separated from frontal rim by a shallow broad groove: 

 frontal Kmb narrow in the middle, becoming wider toward each ends, and sloping 



