(iv) 60 Pal,eontologia Sinica Ser. B. 



transverse rings ; pleural lobes also marked by broad furrows opposite the transverse rings 

 of the central axis, but much flattenetl. 



Surface apparently smooth under the lens. 



The incurving sides of the glabella, the broad and flat frontal border and narrow 

 fixed cheeks suggest the genus Saukin, but our genus differs from the latter in its longer 

 glabella, three pairs of short slightly impressed glabellar furrows, and also in the position 

 and the comparatively small size of the palpebral lobe. 



This genus is the most common one in the upper zone of the Upper Cambrian of 

 Chau-Mi-Tien and belongs to the family Dikelocephalinse. 



This genus is characterized by its broad, slightly convex frontal border, subrectan- 

 gular glabella with both sides contracting in the middle, narroAV fixed cheeks, large free 

 cheeks, comparatively small palpebral lobe which is centrally placed, and the large 

 pygidium with fiattened border. 



The generic name is given in honor of Dr. H. T. Chang mi^M, former president 

 of tht Geological Society of China. 



Genotype: — Changia chinensis Sun. 



ChANGIA chinensis Sun (sp. nov.) 



I'late IV, Figs. 5 a-g. 



General form large elongate and oval, moderately convex, cephalon transversely 

 semicircular with genal angles extended into a strong spine. Glabella moderately convex, 

 elongate, subcylindrical, contracting opposite the palpebral lobes l)y incurving of the 

 sides of the glabella; marked by three pairs of short glabellar furrows, the posterior pair 

 broad and short extending obliquely backward; the second pair of furrows parallel to the 

 posterior one but short and also slightly impressed, the anterior pair very short and very 

 slightly impressed; occipital furrow broad and shallow arching forward in the middle, 

 occipital ring moderately convex broad in the middle and arching forward. 



Frontal limb very broad, slightly convex, separated from the glabella by a strong 

 distinct groove in the front of the glabella, the frontal margin slightly curved and the 

 antero-lateral angles rounded. Dorsal furrows deep and distinct. 



Fixed cheeks very narrow, slightly convex; the facial suture cuts the frontal 

 border slightly outward and than inward toward the anteric>r part of the palpebral lobe 

 curves around the latter and finally extends outward and Inackward, outlining the postero- 

 lateral limb. Palpebral lobe of medium size and elevated. Postero-lateral limb narrow 



