(iv) S2 PnLeiuilolnghi Simci Ser. B. 



This specie? is represented hy only one crfinidium in the Lnan-Chon (^iH-I) 

 material. Our specimens agrees closely with the type of the species figured by Walcott 

 both in form and size. 



Horizon anp Locality: — Middle Cambrian: from Changhia limestone of 

 Kwan-Hsi-Ying (^®^), Luan-Chou. Collected by Dr. J. G. Andersson. 



Measurements : — 



Length of cranidium 11.0 mm. 



Width of cranidium at palpebral lobe ').8 mm. 



Length of glabella S.5 mm. 



Basal width of glabella 5.0 mm. 



Genus Ill^ENURUS Hall 

 Illaenurus pagoda Sun (sp. nov.) 



Plate V, T^iga lOa-r-. 



Of this species only three pygidia are known. 



Pygidium subtriangular in outline, usually broader than long, moderately 

 convex. 



Shell perfectly smooth without segmentation of the axis except at the frontal 

 part where it is more strongly rounded. One specimen with a part broken away shows 

 verj^ slight axial segmentation in the cast of the interior. This may be one of \\'alcott s 

 pecies. On account of the strong forward-projection, I refer it for the present, to a 

 snew species — lUasnurus pagoda. 



Three specimens measure respectively: length 7.5 mm., 7.5 mm., 8.0 mm.; 

 width 10 mm., 10 mm., 12.0 mm. 



Horizon AND Locality: — Upper Cambrian : from the conglomerate limestone 

 of Kao-Li-Shan, Tai-An, Shantung (Y. C. Sun Coll.). 



Several pj^gidia of this type have been obtained from the Fengshan limestone of 

 Chihli by Mr. H.C. T'an. They may belong to this species but on account of their weat- 

 hered character precise identification is not possible. This species differs from the similar 

 pygidia described by Walcott mainly in the absence of distinct demarkations of the axis. 



