324 My. H. J. Carter’s Contributions to our 
consist respectively of a small solid axis, around which 
radiate in all directions, upwards and outwards, filamentous 
scopiform portions echinated by the projection of the internal 
spicules which, finally dividing, end in a lash of branches, 
and these, united together by the dermal sarcode, support the 
white incrustation of proper spicules on the surface. Spicule 
of one form only, viz. acuate, smooth, curved chiefly towards 
the blunt end, sharp-pointed, less in diameter at the obtuse 
end than in the centre of the shaft, 35 by 1-1800th inch in 
its greatest dimensions (Pl. XIV. fig. 15, a) ; abundant in the 
general mass and axial parts of the scopiform, filamentous 
processes, from which the points more or less project in an 
echinating manner. Size of specimen 6 by 34 inches at the 
base and 4 inches high. 
Hab. Marine. 
Loc, Freemantle, 8.W. coast of Australia. 
Obs. The thickness of the white dermal layer and the com- 
pact solid structure of the interior, together with the mode of 
growth in each, combined with an acuate spicule chiefly 
curved towards the large end, distinguish this sponge from 
Halichondria panicea, which otherwise it so resembles, that to 
all appearance at first sight, as above stated, the two are the 
same. ‘The specimen may be found in the Bowerbank general 
collection at the British Museum. 
My attention was originally called to this species by the 
still greater likeness to LHalichondria panicea of a similar 
specimen in the general collection of the British Museum, 
wherein the structure is not so evident as in the specimen 
above described, owing to the proliferous columnar processes 
of the circumference being less distinct and more involved in 
the general mass, which is globular and large, 7. e. 6 X 6 inches 
in its greatest horizontal diameter and 34 inches high; the 
form otf the spicule is the same, but it is much larger, viz. 50 by 
12-1800ths inch in its greatest dimensions (Pl. XIV. fig. 15, 0). 
It came from New Zealand, was presented by Dr. Sinclair, 
and bears my running no. “473,” with the registration “ 57. 
1, 29." 
Leucophleus compressus, n. sp. (Pl. XIV. fig. 16, a.) 
Stipitate, hard, massive, compressed, lobate, proliferous ; 
lobes flabellate, more or less denticulate at the margin, some- 
times united clathrously ; stem thick, short, hard, expanded 
at the base of attachment. Colour snow-white. Surface 
uniformly even, consisting of a white crust composed of the 
spicules of the species; granulate, continuous, or reticulate 
according to the amount of incrusting material ; sometimes 
