(iv) 56 Pulseontologia Sinica ^^'i'- B. 



Genus SOLENOPLEURA Angelin 

 Solenopleura nodosa Sun (sp. nov.) 



Plate IV, Figg. 3 a, b. 



General form of cranidium transversely subrhomboidal, convex Glabella as long 

 as the width at its l»nse, the sides converging from the base towards the rounded front, so 

 as to narrow tlie glabella about one fourth; anterior portion of the glabella very convex; 

 three pairs of glabellar furrows, the posterior furrow distinct extending obliquely inward 

 and backward and making an angle 45° with the dorsal furrow; the second and anterior 

 pairs short and shallow in the form of pits; occipital furrow broad and well defined by 

 the downward curvature of the posterior margin of the glabella and the rising of the sur- 

 face of the occipital ring ; occipital ring broad at the center, becoming gradually wider 

 towards the sides, with a distinct median node at the posterior margin, dorsal furrow deep 

 and well defined. 



Fixed cheeks very convex at the center and sloping down toward the front 

 groove and the postero-lateral groove, about one half the width of the glabella; palpebral 

 lobe small and situated about in the middle of the glabella. Palpebral ridge moderately 

 distinct, extending from the anterior part of the palpebral lobe, toward the dorsal furrow 

 in front of the second furrOAv of the glabella. Postero-lateral limbs unknown ; frontal 

 limb very narrow and convex in front of the glabella and separated from the frontal rim 

 by the broad and sliallow frontal groove; frontal rim convex, rounded, about the width 

 of the frontal limb and frontal groove combined, and of uniform width, with a straight 

 frontal margin. 



Surface marked by large pustules uniformly scattered. 



This species is represented by two specimens of tlie cranidia. 



This species is characterized by the presence of the small occipital node, palpe- 

 bral ridge and also by the straight frontal margin of the frontal rim, and by the large uni- 

 formly scattered pustules. 



Horizon and Locality: — Middle Cambrian; from the massive cliff-making lime- 

 stone of Chao-Kou-Chuang, Luan-Hsien, collected by National University Excursion 

 under my direction in September 1923. 



Measureinents: — 3 a 3 b 



Length of cranidium 12.5 mm. 0.6 mm. 



Length of glabella 7.5 mm. 3.S mm. 



Width of glabella at base 7.2 mm. 3.5 mm. 



Width of occipital ring at the center 2.0 mm. LI mm. 



Width of fixed cheeks at the palpebral lobe 4.0 mm. 2.0 mm. 



