Vol I. tsuit — Cambrian Faunas of North China (iv) 65 



furrows, the posterior pair very short and broad and the anterior pair slightly impressed, 

 rarely distinct; the second lobe rather transverse, narrow at the center, becoming wider 

 at the sides; occipital furrow distinct and broad arching forward at the center; occipital 

 ring moderately convex, broad at the center and narrow at both sides. 



Fixed cheeks very narrow, about one half the width of the glabella at the palpe- 

 bral lobe; convex near the palpebral lobe, becoming more gentle both in the front and 

 at the back of the palpebral lobe. Palpebral lobe distinctly elevated and separated from 

 the fixed cheeks by an outward bending palpebral furroAv, which extends from the 

 posterior furrow of the anterior lobe to the front of the occipital furrow; dorsal furrows 

 rounded and distinct in confluence with the postero-lateral furrow; postero-lateral limb 

 narrow, the outer ends bending slightly backward ; postero-lateral furrows distinctly 

 marked, very broad near the dorsal furrow, becoming narrower toward the end. 



The facial sutures first cut the front border, then extend inward and backward to 

 the anterior part of the palpebral lobe, curve around this lobe and finally extend back- 

 ward and outward to cut the posterior border of the cephalon. 



Frontal border gently convex, broad at the middle and becoming gradually 

 narrow on both sides, separated from the glabella and the fixed cheeks by a sliallow 

 furrow. 



Free cheeks exclusive of the genal spine, subtriangular in_ outline; the border is 

 Avell defined and extends to the facial suture; the body of the cheek moderately convex; 

 genal spine about the same length as the cheek, pointing backward and slightly outward; 

 the body as well as glabella separated from the border by a distinct groove; the border of 

 uniform width, marked by several irregular striations. 



The associated hypostoma is subrectangular in outline, with obtusely rounded 

 posterior border; the central portion or body strongly convex, marked by a pair of the 

 posterior furrows which extends obliquely inward and backward and are nearly parallel 

 to the margin of the central body. Posterior rim very narrow and elevated, separated 

 from the central portion by a broad posterior groove. 



Fragmentary segments of the thorax are known with the axis gently arched and 

 marked by a distinct groove; pleurte about the same width as the axis, flat and marked 

 by grooves narrowing toward the sides before reaching the end. 



Pygidium subsemicircular in outline and transverse ; the central axial lobe very 

 convex and conical near to the posterior margin of the pygidium, divided by five distinct 

 furrows into five transverse rings and one long terminal ring; the pleural lobes broad 

 marked by nine or more furrows into ten or more segments which extend up to the 

 flat planulate margin of the pygidium. 



