Vol. I, Sun — Cambrian Faunas of North China (iv) 53 



Only one part of the fragmentary segment is known ; the axial segment is moder- 

 ately convex and marked by a strong groove; the pleural segment more or less flat and 

 also marked by a broad distinct groove which gradually tapers to a point before the 

 pleural segment reaches its end. 



Pygidium large subquadrangular in outline; the axial lobe narrow and slender, 

 divided by six distinct transverse furrows into five rings and one terminal section which 

 is usually again divided by a shallow furrow into one ring and the terminal portion, and 

 nearly reaches to the border; the pleural lobes broad, divided by five distinct furrows 

 into six segments. The first two furrows descend with curving outline; while the other 

 three extend obliquely backward to the border, usually short and slightly curved. The 

 largest segment is the second segment from Avhich the lateral spine springs out. The 

 posterior border is narrow, separated from the pleural lobe by the posterior marginal 

 groove, slightly convex and regularly rounded, and also slightly contracted at the posterior 

 margin of the pygidium. Lateral spines about the same length as the pygidium, pointing 

 directly backward but slightly outward. 



Surface strongly marked by high pustules. 



Genotype: Kaolishania pustulosa Sun. 



This very remarkable trilobite resembles the genus Blackivelderia in the form of 

 the glabella, but the strong side spines of the pygidium serve to distinguish it. 



Kaolishania pustulosa Sun (sp. nov.) 



Plate III, Figs. 8 a-h. 



The description given of the genus Kaolishania includes what is known of the 



species. 



This species is characterized by its truncato-conical glabella, narrow and concave 

 frontal border, the distinct palpebral ridge, the short broad side-spine of the pygidium, 

 the strongly pustulose character of the surface and the subquadrangular form of the 



pygidium. 



This is the most common species in the collection from Tai-An. It is associated 



with Mansuyia orientalis (Grabau) Sun, Chuangia batia Walcott etc. 

 Measurements : — ■ 



Cranidium 8 a 8 b 



Length of cranidium U.O mm. 12.5 mm. 



Length of glabella 8.0 mm. 9.5 mm. 



