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Skeleton. The skeleton consists of’only acerate spicules.
The acerate spicules (Plate 24, fig. 1). These spicules are, as
usual, slightly curved, sharp-pointed, 0,2 mm in length. Part
of them are disposed in nets; the fibres are feebly developed
and multispiculated. With regard to the thickness there are
two kinds of acerate spicules, the proportion of the thickness
1:2; the length is the same in both.
Colour. Dried and preserved in spirit, yellowish.
Halitat. Norske, depth 15—25 fathoms (14 Sp.); Mossel Bay,
20 fathoms (96 Sp.).
Reniera ventilabrum n. sp.
Plate 24, fig. 3, Plate 27, fig. 8.
This very fine sponge is represented by one specimen,
broken in three pieces. This Reniera is ventilabriform, and as
to the outer shape it agrees with Isodictya infanäibuliformis L.
(Bow.). The surface is even, perforated bv frequent minute
oscula. The length of the restorated specimen is about 170 mm,
the breadth about the same, and the thickness 3—4 mm. The
margins are slightly attenuated and rounded. The fibres,
radiating from the middle of the blade, are arcuated towards
the surfaces. These fibres are multispiculated and connec-ted
with spicules disposed in nets. The consistency is rather
fragile.
Skeleton. As a t.rue Reniera this new species has only
one kind of spicules, viz. acerate.
The acerate spicules (Plate 24, fig. 3) are generally straight,
rarely curved, sharp-pointed, with a length of 0,25 mm.
Colour. Brownish with a tint of yellow in the specimen
preserved in spirit; a little dried piece of the same is slightly
lighter in colour.
Halitat. Lat. 79° 55’ N., Long. 10° 27’ E., depth 280 fathoms
(286 Sp.).
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