Vol. T. Sun — Cambrian Faunns of North China (iv) 83 



Genus TaianoCEPHALUS Sun (gen. nov.) 



Cephalon semielliptical in outline, very transverse. The greatest convexity lies 

 in the central posterior portion, sloping down both to the frontal margin, and to the 

 antero-lateral angles. 



Glabella truncato -conical, with broad base, the front about two-thirds of the 

 basal width of the glabella; slightly contracted just opposite the palpebral lobes by a 

 slight incurving of the sides. It is marked by two pairs of very broad shallow and short 

 glabellar furrows in the form of shallow basin-like depressions, extending obliquely 

 backward ; A median longitudinal ridge extends from the frontal margin nearly to the 

 occipital furrow. The occipital furrow is represented by one pair of broad lens-shaped 

 depressions separated from each other by a broad space about equal in length to the 

 depression. 



Fixed cheeks narrow in the front and becoming very broad in the posterior 

 parts. Dorsal furrows shallow and distinct; palpebral area at fixed cheek opposite the 

 palpebral lobes moderately convex. Palpebral lobe small and situated nearly at tlie 

 antero-lateral margin of the cephalon. 



The facial suture cuts the frontal border and extends along the palpebral lobe and 

 then backward and outward to the extremities of tlie postero-lateral limbs. 



Postero-lateral limit triangular in outline and marked by a distinct shallow groove 

 confluent with the dorsal furrow, and becoming gradually broader np to the postero- 

 lateral margin. 



Surface marked by pustules visible under a lens, outer test not known. 



This genus is distinct from any known in China and characterized by its semiel- 

 liptical cephalon, truncato-conical glabella, marked by two pairs of broad shallow 

 depressions and the shallow occipital furrow separated by a broad central space, and the 

 large triangular postero-lateral limb. 



Probably it represents one form of the order Proparia with extended postero- 

 lateral limbs. 



This genus is represented by only one specimen, and associated with Kaolishania 

 pustulosa, Mansuyia orientalis, etc. 



