452 CARBONIFEROUS TRILOBITKS OF AUSTRALIA, 



late, greatest width 44 mm., length 26 mm., (the width here given 

 is what the writer considers to be the normal, and is calculated 

 from the width of the left side-lobe and half the spread c)f the 

 axis, because the right side-lobe is distorted). Axis fairly pro- 

 minent, evenly arched without any decided backward or forward 

 inclination of the annulations, of which there are fourteen: the 

 furrows of these are wide and V-shaped in section, ridges high, 

 edged, and bore some small tubercles, bases not tuberculate. 

 Axial furrows shallow. Pleurae very convex, arching strongly 

 from the axial furrows, and showing no decided fulcra; segmental 

 divisions twelve pairs, which reach to the border, and are only 

 wently directed posteriorly, except in the case of the last two 

 pairs; their mesial furrows are V-shaped, wide, and reach to the 

 border, ridges high and chisel-edged, and show no sutures, hence 

 the pleural segments in this oygidium were very completely 

 fused: some of the ridges exhibit evidence of very fine and sparse 

 tuberculation, anterior pair facetti. Border continuous, wide, 

 steep, and its undersurface concentri -ally striated. 



Qf)s. — 11iis pygidium was described and figured by R. Etheridge 

 Junr.,* and considered by him to be identical with a pygidial 

 fragment from near Mt. Morgan, Queensland, and for which he 

 had previously suggested the name Fhillipsia gi-andis.j Mr. 

 Etheridge figured this Queensland specimen, when dealing with 

 some New South Wales trilobites.| The writer is unable to 

 accept Mr. Etheridge's determination of the identity of these 

 two pygidia, for the following reasons. 1. The part of the 

 pleural lobe preserved on the Queensland pygidium shows fifteen 

 segments, and, when complete, without doubt had several others, 

 as against twelve in the New South Wales one. 2. Though the 

 Queensland tail, when complete, was apparently longer than 

 that of the New South Wales specimen, the greatest Midth of 

 its pleural lobes was only 10 mm., as against 15 mm. for that of 



" Mem. Geol. Survey N. S. Wales, Pal. No.o, Pt. ii., 1892, p. 128, text- 

 fig. 5 {uoii PI. xxi., fig. 5). 



t Jack and Etheridge, Cleol. and Pal. of Queensland and New Guinea, 

 1892, pp.2irj, 216. 

 X Mem, Geol. Survey N. S. Wales, Pal. No.5, Pt. ii., 1892, PI. xxi., fig.o. 



