456 CARBONIFEROUS TRILOBITES OF AUSTRALIA, 



tending almost to the distal end of the thorax. Eyes crescentic, 

 relatively large, faceted and depressed. Axial grooves shallow. 



Thorax apparently has the normal number of somites, eight 

 being plainly recognisable by the aid of a lens, the whole surface 

 finely granulated. Axis strongly and rather acutely arched, as 

 wide anteriorly as one side-lobe; posteriorly diminishing gradu- 

 ally, the fourth ring appears to be much stronger than the others, 

 and resembles in this respect the neck-ring; all the rings are 

 directed anteriorly, and bear a row of very fine granules on the 

 ridges. Side-lobes strongly convex, ridges and valleys of the 

 segments strong and deep respectively, ridges bearing rows of 

 fine granules; segmental extremities faceted. Axial furrows 

 narrow. 



Pygidium subtriangular, fairly inflated, granular throughout 

 in a way similar to the thorax; axis prominent, diminishing 

 rapidly posteriorly, and terminating at the border with a moder- 

 ately fine point; the rings appear to be eight in number. Side- 

 lobes convex, made up of six pairs of segments, apparently. 

 Border narrow, steep and continuous. 



Obs. — In so small a specimen, it is a difficult matter to clearly 

 distinguish its features; but, under a lens, they become discerni- 

 ble. The glabella in shape slightly resembles that of a Griffith- 

 ides; and had it not been for the presence on it of three pairs of 

 glabellar furrows, I would have placed it in this genus. It is 

 the smallest and most perfect Carboniferous trilobite belonging 

 either to Phillipsia or Griffithides obtained in Australia. It 

 may represent only an immature individual, but still mature 

 enough to have all its chief parts developed. 



In the shape of the glabella and of the pygidium, this species 

 is not unlike Phillipsia leei Woodw., and P. 7ninor Woodw. 



Dedicated to J. Waterhouse, M.A., Government Inspector of 

 Schools. 



Log. and Hor. — Probable Paterson or Dungog District, N.S. W. 

 Carboniferous. 



Phillipsia elongata, sp.nov. 

 (PL xlvii., figs.3-5; PI. xlviii., fig.14; and PI. 1., figs.4-7) 



Phillipsia duhia Eth. fil,, Mem. Geol. Surv. N. S. Wales, Pal. 



