(iv) 28 



Palseontologia &inica 



Ser. B. 



Locality and Horizon: — Upper Cambrian: lowar part of the Kaoli limestone 

 of Tai-An-Fu, Shantung. (Y. C. Sun Coll.) 



Agnostus hoi Sun (sp. nov.) 



Plate II, Figs. 2 a-d. 



1923 Agnostus hoi Sun, Upper Cambrian of Kaiping Basin, Bulletin of the Geological Society of China. 

 Vol. II, No. 1-2, p. OS. (listed) 



Head shield round, gently convex forming about two-thirds of a circle ; slightly 

 contracted at base. Glabella conical gently convex, with tsvo small transverse triangular 

 lobes forming the postero-lateral portion of the glabella on each side. 



A shallow glabellar furrow curves backwards and separates the small anterior lobe 

 and a large posterior lobe ; and immediately in front of tuis furrow, is situated a small 

 but distinct median tubercle. Dorsal furrow deep and distinct converging toward the 

 front. 



Limb of the cephalon moderately convex, sloping down regularly on all sides to 

 the margin and marked by a slightly impressed frontal groove in the front of the glabella. 

 Border of head shield narrow, rounded, and separated by the strong marginal groove. 



Thorax unknown. 



Pygidium semicircular usually wider than long, moderately convex. 



Axis broad and long, about two thirds the width of the pygidium, laterally cir- 

 cumscribed on each side by one strong deep furrow. It is divided by one nearly trans- 

 verse furrow into two lobes; the anterior lobe is distinctly marked by the median 

 elongated tubercle, especially pronounced near the posterior margin of tlie lobe; one pair 

 of l)road transverse furrows opposite the median tubercle outlines four tubercle-like por- 

 tions one on ea6h corner of the lobe. 



