BY JOHN MITCHELL. 461 



The above differences clearly separate the two species. From 

 all other Australian species, it is easily distinguished. 



Loc. and Uor. — Rockhampton district, Corner Creek, Great 

 Star River, Queensland. Carboniferous. 



Phillipsia stanvellensis, sp.nov. 

 (Plate xlviii.,%s.lO-13; Plate li., figs. 8-10). 



Phillipsia dubia Eth. fil., Geol. and Pal. Queensland and New 

 Guinea, 1892, pp.214-215, P1.8, tig.o. 



Complete form elongately ellipsoidal. 



Sp. Chars. — Cephaloii sub-semielliptic,. strongly inflated, prac- 

 tically smooth, length 6 mm., width between the genal angles 

 9 mm. Glabella bell-shaped or subconical, liigh posteriorly, with 

 a steep anterior droop to the front limb, microscopically gran- 

 ulated, three pairs of lateral furrows, basal pair shallow, the 

 others faint; basal lobes very prominent, relatively small and 

 round, mesial pair subquadrate and about equal in size to the 

 basal pair, front pair well-defined. Neck-furrow shallow cen- 

 trally, but rather deeper behind the basal glabellar lobes, its 

 lateral extensions across the fixed cheeks shallow; neck ring 

 narrow, strongly arched, and its bases tuberculated, lateral ex- 

 tensions weak; front limb narrow, gently thickened, and turned 

 almost on to the front of the glabella; facial sutures anteriorly 

 only moderately sinuate, posteriorly oblique and crossing the 

 fixed cheeks in a line with the fulcra of the thoracic segments. 

 Free cheeks relatively large and steep, border moderately wide 

 and strong, lateral furrows linear and faint. Eyes of moderate 

 size, densely and finely faceted, subcrescentic, and rising steeply 

 from the shallow grooves of the cheeks just below them. Genal 

 angles acute, but apparently not spinate. 



Thorax: length two-thirds of width approximately, and 

 anterior and posterior widths equal; number of somites small, 

 smooth. Axis very prominent, rings arched forward both cen- 

 trally and basally, bases also tuberculate, centrally each ring is 

 rather acute, which gives to the axis when viewed sideways a 

 mildly serrated aspect; ring-furrows rather deep, ridges high and 

 narrow (in decorticated specimens), greatest width 3 m-m., and is 



