var. spinispiculum, Crtr. 159 
bond of attachment. Pores in the spaces between the conuli 
on the surface (fig. 7,4). Hxcretory canal-system consisting of 
the radial chambers, which have been described before as open- 
ing into the cloaca through sphinctered apertures (fig. 6, ad), 
and the cloaca itself, which, occupying the centre of the body, 
consists of a cylindrical cavity corresponding in shape with the 
specimen, that is, narrow behind and wide in front, commen- 
cing in a blind point close to the stem, and ending in a wide 
mouth at the collar (fig. 2, 7/1); surfaced uniformly with circular 
holes, which are the oscular vents of the radial chambers 
above mentioned, arranged with corresponding regularity 
(fig. 2,m), and would be in juxtaposition but for the inter- 
vention of the spicular structure of the body, from which pro- 
jects the fourth arm of the cloacal quadriradiates that are curved 
and directed forwards (fig. 2,) ; limited in front by a sarcodic 
. sphincter which separates the collar from the cavity of the 
cloaca. Size of specimen variable according to age and situa- 
tion ; average of that above described, which grows a little 
below high-water mark on the rocks here (fig. 1), about 
4-12ths inch long by 1-12th inch in its broadest part, not in- 
cluding the lateral spicules, which, as above stated, vary under 
1-6th inch in length. 
Hab. Marine. On Fuct near low-water mark, or abun- 
dant on the under surface of New Red Sandstone rocks a little 
below high-water mark. In company with an equal abun- 
dance of the following Calcispongix, viz. Grantia clathrus, 
G. compressa, Leuconia Johnstonit, L. fistulosa, and Leucogyp- 
sia Gosset, together with the common littoral siliceous sponges 
Halichondria panicea and H. sanguinea. 
Loc. Budleigh-Salterton, south coast of Devon. 
Obs. It is evident that a longitudinal section of the body 
across the radial chambers of this variety shows, as Hiickel 
has stated respecting Sycandra raphanus (op. et loc. cit.), that 
its chambers are ‘‘ hexagonal”’ in contradistinction to those 
of Grantia (Sycandra) ciliata and G. (S.) coronata, which are 
circular; but, as before stated, what these differences may 
amount to from a specific point of view, as they may easily 
graduate into each other under the circumstances, | am not 
prepared to say ; nor am I able to state how far the longer 
spicules with spinous extremities may be absent in these two 
forms, as Hiickel does not mention any, and my own speci- 
mens, which are all dry, fail to show them ; for they are either 
broken off or so inextricably clotted together by hardened 
sarcode as to defy all attempts at disassociation; but the 
spines certainly do not appear on the shorter linear ones of the 
cone specimens which remain in these, while they do so on 
