Vol 1. Sun — Cambrian Faunas of North China (iv) 49 



Fixed cheeks little wider than one half the width of the glabella opposite the 

 glabella and nearlj'^ flat from the dorsal furrow to the palpebral lobe. Palpebral lobe large 

 about one half the length of the cephalon and situated a little back of the central portion 

 of the glabella; palpebral ridge strong and prominent merging into the anterior edge of 

 the palpebral lobe from the dorsal furrow. Frontal limb flat, of medium width, and 

 separated from the frontal rim by a shallow distinct furrow. Frontal rim abovit one half 

 the width of the frontal limb and of uniform width throughout, slightly elevated. 



The associated pygidium, probably of this species, is small with convex broad 

 axial and segmented pleural lobes. 



In form this species resembles Conokeflialina vesta Walcott from the Middle Cam- 

 brian of Shansi, but the broad frontal limb, the absence of the distinct glabellar furrows 

 and the more rounded frontal margin of the glabella serve to distinguish it. 



This species is named in honor of Mr. Jacques Gerard engineer and geologist of 

 the Chao-Kou-Chuang Mines. 



This species is characterized by the acutely rounded frontal margin of the gla- 

 bella, the smooth surface of the glabella, presence of the longitudinal median ridge, large 

 and long palpebral lobe and the small pygidium with broad convex axial lobe and 

 segmented pleural lobe. 

 Measurements : — 



Length of cranidium 

 Width of cranidium at the palpebral lobe 

 Length of glabella 

 Width of glabella at base 

 Width of frontal limb and rim 

 Width of occipital ring 

 HoKizoN AND Locality : —Manto-formation of Cheng-Shan, Chao-Kou-Chuang. 

 Collected by University Excursion in 1923 (H. T. Yu ^W\W> Coll.). 



Genus CREPICEPHALUS Owen. 



Crepicephalus sp. indt. 



Plate III, Fig. 6. 



This is only represented by one pygidium. 



Quadrilateral in outline, exclusive of lateral spines. Axial lobe very convex, 

 cylindrical, with three transverse rings and one terminal ring which is again divided into 

 one transverse ring and one terminal portion, far apart from the posterior margin. The 



