439 
Subsequently Mr. C. Moore figured the largest specimen in the Quarterly Journal of 
the Geological Society, and reprinted tbe description of Bouerbank. Eight years later 
Mr. 11. J. Cartel', E.il.S., gave an emended description of the species, pointing out its 
particular features in a much clearer manner than had been done originally. Mr. 
Carter compared the form with the existing Ducti/localyx fumicens, Stutchbury, and 
with Euplectella aspergiilum. llo also made the rare discovery of one of the flesh 
spicules, a globular rosette, with radiating cajiitatc rays about -joVo diameter 
(PI. 19, fig. 11). Eollowing Mr. Carter’s description. Prof. Zittel gave a diagnosis of 
the genus, and placed it as a Dictyonine llexactinellid in the family Staurodermidoe. 
The character of its spicular structures generally, and tbe absence of hexactinellid 
spicules in the dermal layer of both surfaces of the wall, show, however, that it cannot 
definitely remain in this family. 
“ The example in the British Museum, which is the typical form studied by Dr. 
Bowerbanlc, is about fifty mm. in length aud the same in breadth. It has been imbedded 
in a calcareous matrix, which has been removed by acid, aud the internal structure is as 
clearly shown as in a recent sponge. The spicular skeleton is of a whitish-grey tint by 
reflected, and transparent by transmitted light ; between crossed nicols the silica gives 
the tints of chalcedony. The axial canals of the spicules are now infilled with a lightish 
brown, apparently earthy material. 
“ JSo other species of the genus has yet been discovered.” 
Loc. Wollumbilla {The late Rev. W. £. Olarke'). 
Sitb-Kingdom — ^ECHINODEHMATA. 
Section— PELMATOZOA. 
Class— OniNoiDEA. 
Order -ARTICUL.ITA. 
Family— PENTACEINID^. 
Genus— PRNTAGBINUS, Miller, 1821.* 
(Nat. Hist. Crinoidea, p. 45.) 
Pbntaceinus AirsTR.inis, Moore, PL 20, f. 1-3. 
Pcntacrimis australis, Moore, Quart. Journ. Geol. Soc., 1870, xxvi., p. 243, t. 17, f. 3, t. 18, f. 1. 
Sp. Char. Pelvis short, compressed, rounded ; plates of the body and arms 
finely rugose ; scapulm thick, supporting ten arms, composed of thirteen plates, the 
hands bifurcating from cuneiform joint.?, the fingers being of considerable length, with 
forty or more joints of varying thickness, to which are attached lengthened, jointed 
tentacles. Interior of the pelvis disk-like or concave, exhibitbig a central pit. {Moore.) 
Ohs. Two specimens of this fine aud interesting species are from the Mitchell 
Downs, on the Amby River ; and it is seen by the numerous arms that pass through the 
block of limestone that a whole colony of them must have been present. One of the 
specimens is lying on its side (exhibiting the base of the pelvi.s with its columnar 
articulation), whilst three arras, with the bases of two others, are exhibited. The second 
specimen shows the interior of the pelvis, and has arms flattened out. Each arm, above 
the scapulsB, appe.ars to have been .about six inches in length. In a block from 
Wollumbilla a portion of a column, with ninety-five regular joints, is present, of 
Emend. P. H. Carpenter. 
