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The acerate spicules (Plate 24, fig. 29). The spicules of this
kind are more or less disposed in nets or fasciculated; they
are usually straight, rarely slightly curved at the middle,
tapering from the middle towards the short-pointed
terminations. The length is about 0,4 mm.
The tricurvate spicules (Plate 24, fig. 30) are numerous and
agree well with those of Desmacella pumicea Fristedt*); they
are of a comparatively great diameter, more or less curved at
the middle and at the points.
The minute C-formecl acerate spicules (Plate 24, fig. 31). These
spicules are very minute, only 0,oi mm in length between the
two terminations. They are very numerous both in tlie dermis
and in the inner parts.
Colour. Yellowish grey, when dried or preserved in spirit.
Habitat. North-east from the eastern Taimur-peninsula,
Lat. 76° 52’, Long. 116° E., depth 36 fathoms (39 Y.); Greenland,
Lat, 59° 33’ N., Long. 43° 25’ W., depth 120 fathoms (576 S.).
Genus Desmacella O. S.
Desmacella rosea n. sp.
Plate 24, fig. 32-35, Plate 28, fig. 13.
This sponge is representecl by a very fine specimen from
the east-coast of Greenland. The form is leaf-like. The
surface is uneven and hispid when the dermal membrane is
absent, otlierwise smooth. The dermal membrane is thin,
pel-lucid, only attached to the other sponge-body by fine fibres
formed by the dermis in the following manner. The dermis
is furnished with numerous funnel-like depressions, which by
degrees are closed, forming a fibre. The oscula and pores are
minute, dispersed. The consisteney is rather firm. There are
in the collection several broken specimens, ali from the same
locality and probably pieces of only one specimen. The
largest is 50 mm in length, 40 mm in breadth and 8 mm in
thickness.
*) K. Fristedt, Bidrag till kännedomen om de vid Sveriges vestra kust
lefvande Spongiae (in Kongi. Sv. Vet.-Akad. Handl., Bd 21, N:o 6, pag. 29,
Tafl. 2, fig. 9 a—9 d).
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