444 CARBONIFEROUS TRILOBITES OP AUSTRALIA, 



glabella; whilst the facial suture cuts obliquely across the pos- 

 terior margin, just behind the eye, leaving a small pointed por- 

 tion fixed to the glabella b}' the neck lobe; angles of the cheeks 

 more or less produced, mart^in of head incurved, forming a 

 striated and punctured rim. Thoracic segments nine in number, 

 the axis distinctly marked off from the side-lobes or pleurae by 

 the axal furrows; the abdomen or pygidium usually with a 

 rounded border, the axis composed of from 12 to 18 coalesced 

 segments." 



Phillipsia collinsi, sp.nov. 

 (PI. xlvi., figs. 1-5; PI. xlviii., figs. 8, 9; PL lii., fig. 4). 



Sp. CVtars. — Complete form elongately ellipsoidal. 



Cephalon sub-semielliptic, moderately inflated, densely tuber- 

 culated; glabella sub-oblong or sub-bellshaped, narrow, upper 

 surface flat, steep and straight sided, densely crowded with pro- 

 minent tubercles of variable sizes; medially the tubercles are 

 arranged in four sublongitudinal rows, those on the anterior pari 

 are subconcentric; front gently rounded and bearing a concentric 

 row of tubercles; lateral lobes and furrows distinct, the basal 

 pair altogether circumscribed, and bearing a varying number of 

 tubercles, one usually much larger than the others; limb narrow, 

 witli a gentle upward turn, smooth or very finely granulate; 

 neck-furrow distinct, narrow, and deep behind the basal lobes; 

 neck-ring strong, moderately arched and tuberculate, its lateral 

 extensions being narrow; fixed cheeks very small, eye or palpe- 

 bral lobes bounded by tubercles; eyes apparently crescentic; free 

 cheeks unknown. Axial furrows distinct; facial sutures ante- 

 riorly very gently sinuate (almost straight) and close to the 

 axial furrows; posteriorly straight, and almost at right angles to 

 the axial line, and at last cutting the fixed-cheeks with a sharp 

 backward turn. 



TJiorax oblong, moderately inflated and granulated; axis pro- 

 minent, the rings centrally and at the bases mildly curve forward; 

 bases feebly tuberculated, width equal to that of one side-lobe, 

 median sulci of the rings narrow; pleura? convex, medial furrows 

 of each segment wide and shallow, and reaching the distal end. 



