NO. 4 CAMBRIAN FAUNAS OF CHINA 93 



postero-lateral limbs, the greater part of which is taken up by the 

 strong intermarginal furrow. Glabella without traces of transverse 

 furrows except a short, slight indentation indicating a posterior pair 

 of furrows ; the glabella is separated from the fixed cheeks by a 

 very narrow, strong dorsal furrow ; the frontal limb is about the 

 same width as the frontal margin, and extends almost directly 

 downward from the dorsal furrow in front of the glabella to the 

 sharp angle made by its union with the frontal margin ; fixed cheeks 

 about one-third the width of the glabella opposite the palpebral lobes, 

 gentl}' convex, and merging into the anterior and posterior limbs ; 

 occipital ring separated from the glabella by a strong rounded furrow, 

 it is convex, broad along the center portions, and narrow toward the 

 dorsal furrow. Palpebral lobe small, elevated, and about one-fourth 

 tne length of the cephalon ; a low ridge extends from its anterior end 

 forward and inward to the dorsal furrow beside the glabella. Free 

 cheeks small, gently convex, and bordered by a flattened rim that is 

 continued posteriorly into a spine ; they are separated from the 

 cranidium by the facial sutures which cut the posterior margin a 

 short distance within the genal angles and extend with a slight 

 sigmoid curve inward and forward to the base of the palpebral lobes ; 

 curving around these they extend with a slight outward curvature to 

 the angle formed by the union of the frontal limb and margin, and 

 then curve slightly inward across the margin. 



Thorax with twelve rather narrow, nearly transverse segments ; 

 axial lobe convex, with the segments slightly rounded and separated 

 from the pleural lobes by the obtuse angle formed by the union of the 

 two lobes ; pleural lobes a little wider than the axial lobe and flattened 

 for about half their width, or to the geniculation, where each segment 

 curves downward and slightly backward ; pleural furrow relatively 

 broad ; it starts near the inner anterior edge of the pleural segment 

 and extends along the center of the segment to the genicuhtion, 

 where it gradually narrows to a point near the end of the flattened 

 falcate termination of the segment. 



Pygidium small ; the subconical convex axis is marked by three 

 shallow transverse furrows that outline three rings, and a terminal 

 section that terminates within a short distance of the posterior margin 

 of the pygidium ; pleural lobes marked by the extension of the trans- 

 verse furrows on the axial lobe and the faintly indicated, rather 

 narrow border. 



Surface slightly roughened by shallow pits or a network of very 

 minute, irregular ridges, the interspaces of which give a pitted 

 appearance. 



