Vol I. 



Sun — Cambrian Faunas of North China 



(iv) 55 



Measurements : — 



Length of crnnidium 

 Width of cranidium 

 Length of glabella 

 Width of frontal border 

 Width of occipital ring 



1 a 

 6.5 mm. 

 6.0 mm. 

 4.8 mm. 

 0.9 mm. 

 1.0 mm. 



1 b 



4.0 mm. 

 4.0 mm. 

 3.0 mm. 

 0.5 mm. 

 0.5 mm. 



Lisania rectangularis Sun (sp. nov.) 



Plate IV, Kg. 2 a, b. 



This species is represented by two broken central portions of the cephalon. Gla- 

 bella moderately convex, subrectangular in outline ; frontal margin rounded, apparently 

 smooth; occipital furrow transverse and distinct; occipital ring broad at the center be- 

 coming narrow toward the sides. 



Fixed cheeks narrow, less than one half the width of the glabella, the facial 

 suture cut the frontal border slightly outward, backward to the anterior edge of the palpe- 

 bral lobe ; and thence curves around this lobe near to the occipital furrow ; palpebral 

 lobe large about one half the length of the cephalon, slightly convex. 



Frontal border slightly convex with curving rounded margin, broad at the mid- 

 dle, becoming gradually narrow at the sides. 



This species resemble Lisania cf bura (Walcott) from the Middle Cambrian of 

 Ctianghia, Shantung, but differs in the subrectangular glabella, the large palpebral lobe 

 and the course of the facial suture. 



This species is characterized by its subrectangular glabella, narrow fixed cheeks, 

 large palpebral lobe and the comparatively broader frontal border. 



Horizon and Locality: — Middle Cambrian: from Changhia limestone of Cheng- 

 Shan near Chao-Kou-Chuang, Chihli. Collected by Mr. K. S. Hsu '^^m, of Class 1925 

 of the Geological Institute of National University. 



Measurements: — 2 a 



Length of cranidium 3.5 mm. 



Length of glabella 2.5 mm. 



Width of glabella at palpebral lobe 1.7 mm. 



Width of frontal limb 0.7 mm. 



Width of occipital ring 0. 5 mm. 



Width of fixed cheek at the palpebral lobe I.O mm. 



2b 

 3.3 mm. 

 2.0 mm. 

 1.5 mm. 

 0.6 mm. 

 0.6 mm. 

 1.0 mm. 



