Mr. H. J. Carter on new Sponges. 115 
(vol. ii. p. 294, pl. xxvii. figs. 9-12), which up to this 
time had appeared only from the “ west coast of Africa ;” 
but the one which I am now about to notice was found with- 
out label among a set of sponges in the Bowerbank collec- 
tion from the coast of S.W. Australia, whereby I am inclined to 
infer that it also came from this locality. Although totally 
different in form, it possesses the same kind of spiculation, 
and is infested apparently by the same kind of parasitic polyp ; 
but, being much waterworn and correspondingly mutilated, I 
can only give the following description of it, viz. :— 
Trregularly fan-shaped, very thin, stipitate. Consistence 
firm. Colour now cinnamon-brown. Infested with a para- 
sitic polyp (Bergia), whose anastomosing stoloniferous growth 
forms a branched reticulation of a white colour that contrasts 
strongly with that of the sponge, over both sides of which it 
has spread itself. Size of specimen about 43 inches square 
and ¢ of an inch thick. 
Although the stem is nearly worn off and the edge gene- 
rally appears to have equally suffered in the surf, yet the 
general thickness cannot have been much reduced, or the 
branches of the parasitic polyp would not be still existing 
almost in their entirety over the plane surfaces. ‘The structure 
and spiculation need not be described, as they would hardly be 
different from those of the little digitating branched specimen 
above mentioned. 
Order VI. HOLORHAPHIDOTA. 
Fam. 1. Renierida. 
Group 4. CARNOSA. 
Reniera crateriformis, n. sp. 
Globular, thick, excavated, sessile; excavation cup-like, 
conical; vertically ridged externally, smooth within. Con- 
sistence friable. Colour now whitish grey outside, light 
brown internally. Surface covered with a fine dermal spi- 
culo-fibrous reticulation, rendered irregular on the outside by 
the presence of the vertical ridges, which, becoming shorter 
and more multiplied upwards by subdivision and addition, 
finally end in the thin and even margin of the excavation. 
Vents chiefly on the inner surface and towards the bot- 
tom of the excavation; the rest, which are few in number 
and smaller, external on the ridges. Pores in the fresh state 
probably in the sarcode tympanizing the interstices of the 
fine dermal fibro-reticulation. Structure tterel yet bre- tebe 
