Vl. 1. Sun — Cambrian Faunas of North China (iv) 45 



Frontal limb broad flat or gently concave, its margin slightly rounded. Postero-lateral 

 limb very short and marked by the transverse postero-lateral furrow extending trans- 

 versely to both extremities. 



Free cheeks broad with uniformly narrow border extending into a slender curving 

 genal spine; cheek body flat and broad. An associated hypostoma elongate ovate with a 

 distinct posterior curving furrow. 



Only the pleuras of the thorax are known, these being flat and of uniform width, 

 and separated from each other by parallel furrows. 



Pygidium transverse, with uniform narrow border. Axial lobe conical marked 

 by four transverse furrows into four transverse rings and one terminal section which is 

 situated near to the posterior border of the pygidium. Pleural lobe also segmented. 

 Antero-lateral angle extending into a round extension. 



The truncato-conical glabella, broad frontal limb and the transverse form of the 

 pygidium may suggest Ptychoparia ( Emmerichella) , but the conical glabella, the ratio of 

 the anterior width to the posterior width of the cranidium, comparatively narrow fixed 

 cheeks and the antero-lateral extension of the pygidium serve to distinguish it. 



Genotype — Changshania conica Sun. 



Changshania conica Sun (sp. nov.) 



Plate Iir, Figs. 2 a-k. 



1923 Changshania conica Sun. Bulletin of the Geological Society of China Vol- II, No. 1 — 2 (listed). 

 The generic description of Changshania is based on this species. 

 This species is represented by several cranidia, separated free cheeks, an hypos- 

 toma, pleurae of the thorax and by a number of pygidia. 



This species is characterized by its subconical smooth glabella, narrow anterior 

 width of the cranidium, long palpebral lobe, comparatively narrow fixed cheeks and the 

 pygidium with round antero-lateral extensions. 



Horizon and Locality: — Early Upper Cambrian: from Changshan shale of 

 Chao-Kou-Chuang. 



Measurements : — 



Cranidium A B C D 



Length 9.0 mm. 7.5 mm. 6.5 mm. 6.5 mm. 



Anterior width 7.5 mm. 5.6 mm. 5.0 mm. 5.0 mm. 



Posterior width 17.8 mm. — 12.5 mm. — 



