NO. 3 CAMBRIAN TRILOBITES 225 



This species differs from the K. minor in its greater size, 40 mm. 

 in length by 30 mm. in breadth ; the fixed cheeks are wider and the 

 grooves on the pleurae are narrower. In one of the large specimens 

 the surface of the glabella is covered with fine, irregular elevated 

 striae. 



Formation and locality. — Middle Cambrian : (14s) Stephen forma- 

 tion ; about 2,300 feet (701 m.) above the Lower Cambrian, on the 

 northwest slope of Mount Stephen, above Field, on the Canadian 

 Pacific Railway, British Columbia, Canada. 



HANBURIA, new genus 



General outline of dorsal shield a broad oval; convex; axial and 

 pleural lobes clearly defined. 



Cephalon transverse, semicircular when not distorted; genal 

 angles rounded on the postero-lateral limbs ; marginal border narrow 

 and wire-like on the outer margins; posterior border broader and 

 flatter and well defined by a narrow furrow that curves forward at 

 the genal angles to unite with the narrow furrow within the outer 

 border. Glabella large, increasing in width by gradual divergence 

 of the sides to the broadly rounded transverse frontal margin ; three 

 short raised lobes, one outlined on each side by furrows or depres- 

 sions that join a longitudinal depressed area extending along the 

 median line; dorsal furrow beside the glabella indistinctly defined; 

 occipital ring narrow, transverse, and a little raised above the slight 

 occipital furrow ; frontal limb wider than the border in advance of 

 the glabella. Fixed cheeks broad, slightly convex, and with rounded 

 genal angles. Free cheek, if present, narrow, elongate, narrowing 

 to a point where it joins the border posteriorly and anteriorly in 

 front of the antero-lateral angle of the glabella. Supposed eye lobe 

 indistinct and it may not be present ; it appears to be situated oppo- 

 site the anterior fourth of the glabella, but it may be only a slight 

 flexure of the thin test. 



The facial sutures are very uncertain, and it is doubtful if they 

 are present at all. 



Thorax with seven sharply defined narrow segments. Axial lobe 

 about two-thirds the width of the palpebral lobes and clearly outlined 

 by the dorsal furrows ; pleural lobes flattened ; each pleural segment 

 terminates in a blunt rounded end; it has a broad rounded furrow 

 that occupies nearly all its surface for about three-fifths of its length 

 and then narrows to a point just inside the outer end of the segment ; 

 a slightly faceted surface extends along the outer anterior edge of 

 the segment, and the back edge is rounded. 



