NO. 4 CAMBRIAN FAUNAS OF CHINA . 95 



this they extend downward and with a gentle outward curve across 

 the frontal limb and then curve inward across the broad frontal 

 margin. Cranidium with a rather large, subconical, moderately 

 convex glabella that shows very slight traces of lateral furrows. 

 Occipital ring separated from the glabella by a furrow that is rather 

 shallow and nearly transverse ; occipital ring slightly convex and of 

 nearly uniform width. Fixed cheeks narrow, about one-fourth or 

 less of the width of the glabella ; posteriorly they merge into the 

 large subtriangular postero-lateral limbs which are marked by a 

 shallow, intermarginal posterior furrow ; anteriorly the fixed cheeks 

 pass gently down and merge into the frontal limb. Palpebral lobe 

 small, less than one-fifth the length of the cephalon ; it is continued 

 in a low ridge diagonally across the fixed cheek to the antero-lateral 

 margin of the glabella. Frontal limb less than one-half the width 

 of the broad, gently convex, frontal border ; in front of the glabella 

 it slopes gently downward to a shallow furrow that serves to dis- 

 tinguish it from the frontal border. Free cheeks unknown. 



Thorax with twelve rather narrow, slightly convex segments with 

 pleural lobes that arch slightly backward ; axial lobe of each segment 

 moderately convex and unmarked, so far as known, by any tubercles 

 or spines ; at a clearly defined dorsal furrow it unites with the pleural 

 lobe which is about one-third wider than the axial lobe ; the pleural 

 furrows originate at the anterior inner side of the pleural segment 

 and extend outward subparallel to the anterior margin about one- 

 half the length of the pleural portion of the segment ; the deepest 

 portion of the furrow is just within the narrow anterior border 

 which is about one-fourth the width of the segment ; the exterior 

 half of the segment is gently convex and terminates in a rather 

 bluntly rounded end which may possibly be continued backward as a 

 very short spine or point. 



Pygidium large- moderately convex, with a short, convex axial 

 lobe and very broad, campanulate margin ; axial lobe about one-half 

 the length of the pygidium, marked by two shallow, transverse fur- 

 rows that are continued out on the gentle downward slope of the 

 pleural lobes, outlining two segments marked by short, shallow, 

 narrow furrows ; the outer portions of the pleural lobes are nearly 

 flat or rising slightly toward the postero-lateral margins ; the seilii- 

 circular outline of the pygidium is interrupted toward the median 

 axis by a slight inward curvature. 



Surface slightly roughened, l)ut not pitted or punctate so far as 

 can be determined. The outer half of each pleura is marked by 



