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Skeleton. The skeleton consists of spicules of twc>
kinds, viz.: spinulate spicules and minute C- and S-formed
(bihamate) spicules.
The spinulate spicules (Plate 24, fig. 32, 33). The size of
these spicules varies considerably. They are ali furnished with
a well developed head, abruptly sharp-pointed in the other
termination; thev are usually straight, rarely slightly curved.
The length varies from 0,25 to 0,5 mm. The largest spicules
are the most numerous.
The minute bihamate spicules (Plate 24, fig. 34, 35). These
spicules, both C- and S-formed, are numerous. The straight
length between the points is about 0,o25 mm.
Colour. This species is of a very fine rose-colour, when
dried or preserved in spirit.
Habitat. East-coast of Greenland, depth 125 fathoms (579 S.).
Desmacella porosa n. sp.
Plate 24, fig. 36, 37, Plate 28, fig. 15.
One large specimen represents this new species. The
sponge is thickly incrusting, forming an irregular kuoli, the
greatest diameter 90 mm, the smallest 60 mm. The dermal
membrane is thin, pellucid, perforated by several holes giving
it the appearance of a net, Only a small part of the dermal
membrane is present, The other part of the surface is even,
slightly rough.
Oscula are numerous, dispersed.
The sponge is perforated by several, tolerably large
chan-nels, resembling Euspongia Bronn. The skeleton spicules form
a net-work like the species of Reniera Ndo.
Skeleton. The skeleton consits of acerate spicules and
of bihamate spicules.
The acerate spicules (Plate 24, fig. 36). These spic-ules agree
well with those of several species of Reniera; they are slightly
curved or straight, tapering from the middle towards the sharp
points. The length is constant, 0,35 mm.
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