242 F. R. Coicper Reed— A New Carhomferous Trilobite. 



with shortest side on axal furrow. Small median tubercle also 

 present on neck-ring. 



Facial suture cuts anterior border of head-shield almost at a right 

 angle ; from this point it curves backward and inward to the 

 glabella, bending again outwards between the first and second 

 glabella-furrows and defining a large, long, crescentic eye-lobe, at 

 the base of which it turns sharply outwards and runs in an oblique 

 direction to meet the posterior border of the head-shield at a very 

 acute angle. 



Eye-lobe extends from second furrow of glabella nearly to neck- 

 furrow. 



Free-cheek smooth, triangular, surrounded by raised rounded 

 border ornamented with four or five raised concentric lines on 

 upper surface. Genal angle obtuse, not produced into a spine. 



Eye large, reniform, prominent, marked off from surface of free- 

 cheek by encircling, broad, shallow groove. Surface finely facetted 

 as in Phill. gemmulifera. 



Thorax incompletely known. In one partly enrolled specimen 

 seven segments of the axis are preserved which are attached to a 

 head-shield. These segments are smooth and devoid of tubercles. 

 The axis is gently convex, and very gradually diminishes in width 

 towards the pygidium. The pleurte in this specimen are un- 

 fortunately broken off, but were apparently about equal in breadth 

 to the axis. 



Pygidium semicircular, gently arched, edge smooth, slightly 

 bevelled, without any marginal rim or grooved area. Axis promi- 

 nent, rounded, rather more than one-third the width of pygidium, 

 composed of twelve rings, each bearing an almost obsolete low 

 median tubercle (scarcely visible on the posterior rings), with 

 a lateral, stronger tubercle on each side, separated from the median 

 one by a distinct, small, oval, striated patch, visible only in the cast. 

 Axis extends a little over three-fourths the length of the pygidium, 

 gradually tapering to its posterior end, which is obtusely pointed. 

 A faint ridge slopes down with diminishing strength from the end 

 of the axis to the margin of the pygidium. 



Pleural portions of pygidium, forming area gently arched down- 

 wards from axis, marked on each side by 8-10 ribs, of which only 

 the first three or four are distinct, the posterior ones being very 

 faint and almost obsolete. The first furrow is strong and reaches 

 the lateral margin of the pygidium ; the second becomes weak 

 before reaching the margin ; the third is still weaker and shorter ; 

 the fourth is generally distinguishable in the cast, but those behind 

 it are scarcely visible. The ribs are each marked with a central 

 longitudinal groove, and each rib bifurcates at the weak fulcrum, 

 which is situated about half-way along their length and is only 

 perceptible in the first two or three ribs. These three first ribs 

 reach the margin with distinctly bifurcated ends, but decrease in 

 strength beyond the fulcrum. The posterior ribs, though much 

 weaker along their whole length, are, nevertheless, traceable to the 

 pygidial margin. 



