to our Knowledge of the Spongida. 347 
diameters respectively. Size of specimen 4| inches in its 
longest horizontal diameter by | inch high. 
Hah. Marine, growing on hard bodies. 
Loc. Jamaica. 
Ohs. Examined in the dried state. The dark-brown colour 
of the surface appears to arise from the tendency of the sarcode 
superficially to a glutinous consistence. Internally it is pre¬ 
cisely like that of Halichondria suherea, Johnst.,= Suberites 
domuncula , Sdt., and but for the form of the spicules, which 
can only be determined by microscopical examination, might 
be mistaken for it. There are three specimens of this sponge in 
the British Museum, all of which come from Jamaica, viz.:— 
that above described, which is registered 43. 2. 13. 53, with 
my running no. E 55, h, 14 ; another about the same size on 
the back of a crab, numbered 707, which came from Dr. 
Bowerbank’s collection ; and a third about the size of a small 
hazelnut, growing round the stem of a zoophyte, registered 
50. 5. 8. 35; also a minute white parasitic patch of it on 
the surface of an undescribed species of Reniera with nodular 
surface, large conical crateriform lobes and sausage-shaped 
spicule, registered no. 40. 16. 12. 49, and no. 504 E, c, 7 
(?from Madeira), in which the angulated spicule attains the 
u larger size ” mentioned (viz. fig. 8, Z>), and abnormally is 
often accompanied by a third arm growing out from the 
middle of the shaft at right angles, so as to give the spicule a 
triradiate form. 
Suberites fuliginosuS) n. sp. 
(PI. XXVIII. fig. 9, a, h.) 
Massive, spreading, botryoidal, lobular, corrugated, sessile. 
Colour soot-black. Tissue cork-like. Surface uniformly 
subbotryoidal. Pores not seen. Vents numerous, scattered 
over the botryoidal elevations, often grouped. Internal struc¬ 
ture composed of a multilocular or cellular labyrintliic skeleton, 
densely charged with the spicules of the species; the labyrin- 
thic cavities filled with black sarcode also charged with similar 
spicules, contrasting strongly in the section with the lighter 
colour of the skeleton. Spicules of two forms, both skeleton-, 
no flesh-spicule, viz.:—1, straight or slightly curved, fusiform, 
smooth, inflated and spined at each extremity, 1-857th by 
l-4800th inch in its greatest diameters (PI. XXVIII. 
fig. 9, a) ; 2, cylindrical or acuate, thicker and shorter than the 
foregoing, spined all over, l-92nd by 1-1500th inch in its 
greatest diameters (fig. 9, h). Both mixed together through¬ 
out the sponge, but the latter very sparingly. Size of largest 
