(iv) 44 Palxontologio. Sinica Ser. B 



Surface apparently smooth. 



This species is distinguished by its smooth character of the cranidium, short and 

 broad glabella, narrow occipital ring, comparatively narrow frontal limb, and by its 

 transveise form. It differs from P. fongi Sun in the absence of distinct glabellar furrows, 

 in the shorter and broader glabella, and the more transverse form. It also differs from 

 Ptychoparia yohi Sun in the more transverse form, the shorter and broader glabella and 

 the absence of the glabellar furrows. 



Measurements : — 



Oephalon 



Length of cranidium 

 Frontal width of cranidium 

 Posterior width of cranidium 

 Length of glabella 

 Greatest width of glabella 

 Width of fixed cheek 

 Width of frontal rim 

 Width of frontal limb 

 Width of occipital ring 



Horizon and Locality :— I^ower Cambrian: from micaceous purple shale of 

 Cheng-Shan, 8 H from Ghao-Kou-Chuang, Chihh. (Y. C. Sun Goll.) 



Genus Changshania Sun 



192H 



Changshania conica Sun and Chanshania truncata Sun, Bulletin of the Geological Society of 

 (.;hina Vol. 11, No. 1-2. 



Cephalon semicircular in outline, exclusive of genal spine, gently convex. 

 Frontal rim rather narrow about the same width as the postero-lateral limb. Glabella 

 slender, truncato-conical or conical and smooth; occipital furrow straight and distinct- 

 occipital ring nearly transverse and of uniformly width; dorsal furrows shallow and 

 distinct. ' 



Fixed cheeks narrow, the facial suture cuts the frontal border slightly inward and 

 baclavard straight to the anterior part of the palpebral lobe curves around the latter; and 

 then extends obliquely outward diiectly to the postero-lateral margin. Palpebral lobe 

 long about two-third the length of the glabella, outlined by the intra-curving furrow. 



