484 CARBONIFEROUS TRILOBITES OF AUSTRAfJA, 



widest at the base, with one verv minute obscurely marked 

 cephalothoracic furrow at the base on each side; all the segments 

 of the pygidium with an irregularly tuberculated ridge along the 

 middle; lateral segments forming large tubercles where they join 

 the thickened limb, opposite each of which there is a short 

 slender spine projecting from the margin. " 



The following is a fuller description of the species by F. ]>. C. 

 Reed {op. ci^.) :—" Head-shield semicircnlai', moderately convex, 

 with strong raised rounded border increasing slightly in width 

 towards the front, and separated off by a deep furrow. Genal 

 angles furnished with slender divergent smooth spines, less than 

 half the length of the head shield. At its base is a pair of small 

 nodular basal lobes, in most specimens quite inconspicuous. 

 Two large tubercles are situated in a line down the middle 

 of the glabella, followed by a similar median one on the occipital 

 segment. Occipital segment strong, rounded, separated off 

 by a deep furrow. On cheeks at anterior end of glabella is a 

 pair of large tubercles one on each side. No facial sutures 

 visible. Eyes prominent, reniform, less than half the length of 

 the glabella, distant from the axial furrows about one-third the 

 width of the cheeks, and about their own length from posterior 

 margin. Surface of head-shield, including glabella, border and 

 neck-segment, rather coarsely tuberculated. An indistinct ring 

 of larger tubercles surrounds the eyes, and a large tubercle is 

 situated at each end of eyes on innei- side. Thorax unknown. 

 Pygidium semicircular, slightly convex, with spinose maigin. 

 Axis broad, conical, about one-third the width of the pygidium 

 at front end, tapers rather rapidly to obtuse point, nearh^ touch- 

 ing the border: consists of 9-10 segments, of which eight rings 

 are distinct and completely tuberculated across : the 1st, 3rd, 

 5th, and 7th have, in addition, a large median tubercle. Lateral 

 lobes consist of six (\ seven in some) pairs of pleurae, of which 

 the last pair is very small: each pleura is gently curved and is 

 divided unequally by a strong longitudinal furrow into a broader, 

 raised, rounded, posterior ridge, and a narrower anterior ridge. 

 The posterior ridge of each pleura crosses a distinct, raised, 

 rounded bordei;, which surrounds the pygidium and bears a large 



