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The hastate (obtuse) spicules (Plate 25, fig. 9). The spicules
of this kind are verv few in number and totally smooth. Their
length is 0,2 mm; the ends are obtuse or hastate.
The equianchorate spicules (Plate 25, fig. 10). These spicules
are numerous both in the dermal membrane and in the
inter-stitial membranes. Their length is 0,035 mm.
The bihamate spicules (Plate 25, fig. 11, 12) are both C- and
S-curved; they are very slender. The length between the points
is about 0,02 mm.
Colour. From light to light-grey, when preserved in spirit.
Habitat. East-coast of Greenland, depth 130 fathoms (580 S.).
Hastatus indistinctus n. sp.
Plate 25, fig. 13—19.
This sponge is massive, elongated, the length 45 mm, the
thickness 20 mm, and the breadth 15 mm. It is attached to a
Balanus. The surface is smooth and even. I have seen neither
oscula nor pores. The dermal membrane is well preserved,
thin and spiculous. The consistency is fragile.
Skeleton. The skeleton consists of spined or smooth
acuate spicules, of hastate or obtuse, equianchorate and of
bihamate spicules, the last-mentioned of two kinds.
The (spined) acuate spicules (Plate 25, fig. 13) are most often
spined, the spines being exceedingly few in number. Sometimes
the spicules of this kind are totally smooth. They are straight
or slightly curved. The length 0,35 mm.
The hastate (obtuse) spicules (Plate 25, fig. 14) are totally smooth;
the ends are generally sharp-pointed, rarely, as in the figure,
obtuse. They are often curved, the length being 0,2 mm.
The equianchorate spicules (Plate 25, fig. 15, 16). These
spicules are very numerous; their length is 0,o25 mm.
The great bihamate spicides (Plate 25, fig. 17, 18) are C- and
S-curved, the straight length between the points being 0,os mm.
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