(iv) 48 Palseontologia Sinica Ser. B. 



separated from the frontal rim by a shallow forward curving furrow , frontal rim about 

 the width of the frontal limb, slightly elevated and with regularly rounded margin. 



Only one segment of the thorax is known. Axial and pleural segments are both 

 strongly marked by distinct grooves. 



Surface marked by strong pustules. 



In form this species is similar to G. vesta Walcott of Fang-Lan-chon, Shansi, but 

 differs from the latter in the narrow occipital ring, distinct glabellar furrow, indistinct 

 palpebral ridge and the pustulose character of the surface. 



The pustulose character of the surface and the narrow fixed cheeks suggests Gono- 

 Icephalina belus Walcott from Tai-An, Shantung, but it differs from the latter in the 

 narrow occipital ring and in having the palpebral lobe placed further back and opposite 

 the posterior pair of glabellar furrows. 



This species is characterized by the subrectangular glabella, distinct glabellar 

 furrows, pustulose character of the surface and the palpebral lobe placed back of the 

 center of the glabella. 



Measurements : — 4 a 



Length of cranidium 8. 5 mm. 



Width of cranidium at the palpebral lobe 9.5 mm. 



Length of glabella 5.5 mm. 



Width of glabella 5.0 mm. 



Width of frontal limb 1.0 mm. 



Width of frontal rim 1.0 mm. 



Width of occipital ring 1.3 mm. 



Horizon and Locality: —Late Lower Cambrian: from Manto shale of Chao- 

 Kou-Chuang, Luan-Hsien, Shantung. Collected by H. T. Yu (^ftl15) . 



Conokephalina gerardi Sun (sp. nov.) 



Plate III, Figa. 5 a-c. 



This species is represented by several fragmentary cranidia and associated 

 pygidia probably referable to it. 



Cranidinm gently convex, subquadrilateral in outline, exclusive of free cheeks. 

 Glabella subquadrilateral, slightly narrower in front, frontal part rounded, marked by a 

 distinct longitudinal ridge ; occipital furrow narrow shallow, slightly curved backward ; 

 occipital ring broad in the center, becoming narrow at both sides. 



