G7 
II -DESCRIPTION OF THE GENERA AND SPECIES. 
ECHINODERMATA. 
Division — EOHIN OZO A. 
ECHINOIDEA. 
' Order — Palsechinoidea. 
Snh-order — Perisclioecliiiiidip. 
Ohs . — In addition to the specimens hereinafter described as Archceo- 
cidaris? Selwyni, and Archceocidaris, 6?^;., afew fragments of spines have been 
met with, hut in no case sufficiently well marked or jircserved to warrant 
descrij)tion. A single plate has been found in the Permo-Carbonifcrons 
of the E-ockhampton District, Queensland. 
Family— A B CILJEO CIDABIDFE. 
Ohs . — This family is represented in our Permo-Carboniferous rocks by 
one genus only. It is unknown from Western Australia, hut a single plate 
impression has been found by Mr. C. W. de Vis, in the Gympie Series, of the 
Ilockhampton District, Queensland. 
ARCH.EOCIDAEIS, 3IcCoy, 1811. 
(Syuop. Carb. Lime. Foss. Ireland, p. 173.) 
AECIIyEOCIDAniS ? SeLWYNI, sp. 7100. 
PI. XV, Figs. 1-3. 
Sp. Char . — Test fully four and a half inches in diameter at the greatest 
periphery. Interamhulacral plates very large, quite a quarter of an inch in 
diameter, with prominent rim-like edges ; surfaces concave from the edges 
to the miliary rings, which, with the primary tubercles are large and 
