(iv) 54 Palxentologia Sinica S*'*- -°- 



8a 8 b 



Width of cranidium at palpebral lobe 13.0 — 



Horizon and Locality: — Upper Cambrian: from massive gray limestone of 

 Kaolishan from which the generic name is derived (Y. C. Sun Coll.) . 



Genus LISANIA Walcott 

 Lisania ? hsuchiachuangensis Sun (sp. nov.) 



Plate IV, Fig. 1 a-b. 



Cranidium subquadrilateral in outline, exclusive of the free cheeks. Glabella 

 strongly convex subrectangular ; antero-lateral angle rounded; apparently smooth ; occipi- 

 tal furrow shallow but distinct; occipital ring narrow at both sides, becoming broader 

 toward the center marked by a distinct central occipital node. Dorsal furrow narrow and 

 clearly defined. 



Fixed cheeks narrow, little more than one third the width of the glabella, sloping 

 anteriorly to the frontal border and backward to the postero-lateral limbs ; palpebral lobe 

 about one-third the length of the cephalon ; palpebral ridge distinct ; frontal border 

 slightly convex rounded in front very broad at the middle and separated from the gla- 

 bella and the fixed cheeks by a narrow deep and distinct furrow. Postero-lateral limbs 

 narrow about one half the width of the glabella and pronounced. 



This species may be compared with L. agonius Walcott from the lower shale 

 member of the Kiu-lung group of Yen-Chuang M ffi, Shantung, but differs from the 

 latter in the more rectangular form, comparatively narrow occipital ring and in its 

 shorter palpebral lobe. 



Horizon and Locality: — Middle Cambrian: from the Cbanghia limestone of 

 Cheng-Shan, near Hsu-Chia-Chuang ^^^, Luan-Hsien, Chihh. (Coll. K.S. Hsu#^^). 



