6Y JOHN Mitchell. 4/3 



Sp. Chars. — Pyyidiuiu semielliptic, moderately convex, and 

 microscopically granulated. Axis very prominent, consisting of 

 ten, possibly eleven rings, not as wide as one side-lobe, evenly 

 arched, and slightly flattened dorsally, ending at the border very 

 prominently and rather acutely, ridges and valleys of the rings 

 quite distinct. Axial grooves shallow. Side-lobes mildly convex, 

 consisting of eight or nine pairs of segments, -which are only 

 very gently directed backward, and terminating at the border, 

 except in the case of the anterior pair, which encroaches on it. 

 Mesial furrows and the ridges of the segments moderately defined. 

 Border proportionately wide and continuous, mildly convex, 

 horizontal, and apparently wider laterally than behind, separated 

 from the ribs by a shallow furrow. Greatest width 13 mm., 

 length 9 mm., anterior width of axis 3 mm. 



Obs. — Thispygidium was placed by Mr. Etheridge, Junr., with 

 his Fhillipsia grandis, but to this species I find it has no close 

 relationship. In its wide border, and the number of axial rings 

 and pleural segments, it bears strong resemblances to our 

 Gri(tithides conveoncaudatus, but its axis is much more prominent 

 and relatively narrower, than is that of the latter. The axial 

 and pleural divisions are more clearly defined in the former than 

 they are in the latter; the border in the former is ilat, and in the 

 latter very steep. The shape or outline of the pygidia of these 

 species is very different. In number of axial and pleural 

 divisions, this species is related to both i". cordteri and /-*. staii- 

 reUensls, but not otherwise. In possessing very prominent and 

 relatively nai-row axes, P. stanvellensis and the present species 

 agree. I am not aware of any foreign Carboniferous trilobite 

 having a pygidium closely resembling this one. 



Named after Mr. Connolly, wlio discovered it. 



Loc. and llor. — Gascoigne River, AN'est Australia (Connolh'). 

 Carboniferous. 



Phillipsia kouchklensis, sp.nov. 



PkUiipsui sp., ind. {a), Eth. til., Mem. Geol. Surv. N. S. Wale.s, 

 Pal. No.5, Pt. ii., 1892, p.l29, PL xxi., tigs. 6, 7. 

 (PI. xlviii., figs. 4, 5, 6, 7). 



