Vol I. 



Sun — Cambrian Faunas of North China 



(iv) 41 



This differs also from P. yohi in the shoiter and less conical glabella, presence of 

 three distinct glabellar furrows and also in the upturned frontal rim. 



This species is characterized by the subconical glabella distinctly marked by three 

 pairs of furrows, comparatively narrow frontal limb and the wide fixed cheeks. It 

 is named after Mr. K. L. Fong mMM, dean of the Geological Department of Chun- 

 Chow University r^tjmz^, Honan. 



Measurements: — 10 a 10 b 



Length of cranidium 8.5 mm. 6.5 mm. 



Frontal width of cranidium 8.0 mm. 6.2 mm. 



Posterior width of cranidium 1.3 mm. 1.0 mm. 



Length of glabella 5.0 mm. 3.8 mm. 



Anterior width of glabella 3.2 mm. 2.5 mm. 



Posterior width of glabella 4.5 mm. 3.5 mm. 



Width of frontal rim 1.5 mm. 1 .2 mm. 



Width of frontal hmb 1.0 ram. 0.9 mm. 



Width of occipital ring 1.4 mm. 1.1mm. 



Horizon and Locality: — Lower Cambrian: from Manto shale of Chengshan, 

 8 li east of Chao-Kou-Chuang, Chihli. (Coll. F. F. Mathieu and Y. C. Sun). 



Ptychoparia leichuangensis Sun (sp. nov.) 



Plate II, Figs. 11 a, b. 



This species is represented by two small fragmentary cranidia. 



Head-shield semicircular, usually much wider than long. Glabella short and 

 broad, subconical, rounded in front, decreasing in width anteriorly, its length about one 

 half the lengtli of the head-shield: convex and marked with three pairs of short horizon- 

 tal distinct glabellar furrows, occipital furrow transverse and distinct; occipital ring broad 

 in the center, becoming narrow at both sides; dorsal furrows deep and well marked. 



Fixed cheeks gently convex about two thirds the width of the glabella opposite 

 the palpebral lobe ; palpebral ridge distinct and horizontal, extending from the anterior 

 furrow to the palpebral lobe. Frontal limb moderately convex, about one-third the 

 length of the glabella, and separated from the frontal rim by a distinct marginal furrow. 

 Frontal rim narrow and elevated about two-tliirds the length of the frontal limb. 



The facial suture, after cutting the frontal border, diverges slightly outward down 



