New Species of Sponges. x67 
cipal longitudinal and transverse fibres. The regular quad- 
rate areas of the body-wall also mark it off from Plecto- 
derma and Phormosella, Hinde. (See Brit. Foss. Sponges 
pt. i. pl. i., figs. 1, 2 and pt. li. p. 124-5, Pal. Soc., 1886-7.) 
How far it may resemble Dictyophyton,* Hall, and the 
other genera associated therewith by Prof. Hall [85th 
Report of the State Museum (1884) p. 465, pls. 18-21], it is 
impossible to state, for, so far as I am aware, the structural 
features of this genus have never been sufficiently describ- 
ed, and the characters assigned to the other genera are 
mainly those of external form, which, as regards this 
group of sponges, are hardly of generic importance. 
The structures of Cyathophycus, as shown in these speci- 
mens, bears a great resemblance to that of the recent 
genus, Holascus, Schulze, (Challenger Reports, Vol. xxi., p. 
85) based on sponges dredged from depths varying between 
1375 and 2650 fathoms in the South Atlantic and in the 
Southern Ocean. There is a striking similarity in the 
structure of the sponge-wall in the fossil and in the original 
specimens described by Schulze, now in the British Mu- 
seum of Natural History. 
Cyathophycus Quebecensis, Dawson. (No. 3 of previous 
paper.) 
One of the specimens thus named is the basal portion of 
an apparently elongated tubular sponge, the wall of which 
consists of cruciform spicules disposed in longitudinal and 
transverse fibres, as in the type of the genus. The speci- 
men is too imperfect and the spicular mesh too broken up 
to permit of minute discription. On other rock-fragments 
are fibres or strands of straight elongated spicules, either 
parallel with each other or irregularly scattered over the 
*Tf the spicular structure of Dictyophyton should prove similar to 
that of Cyathophycus, this latter named will have to be suppressed 
in fayor of the former, which has the priority. Both these names, 
applied under the supposition that the organisms were plants, are 
alike unsuitable, and it might be advisable, as suggested by Prof. 
Whitfield, to reinstate Conrad’s original name, Hydnoceras. [In the 
only species of the Dictyospongide in which I have seen struc- 
ture, that named by Whitfield Uphantenia Dawsoni (Am. J. 
