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The gastric quadriradiate spicules (Plate 22, fig. 22). All the
rays are of the same diameter, sharply pointed and curved.
The apical ray is about 0,7 mm in length, the lateral rays
reaching a length of 0,2 mm.
The parenchymai quadriradiate spicules (Plate 22, fig. 21). All
the rays of these spicules are of nearly the same diameter and
length, the apical ray a little longer. The length of the rays
is 0,2—0,3 mm. These spicules are not so sharply pointed as
the gastric quadriradiate.
The triradiate spicules (Plate 22, fig. 17—20) are as usually
distinguished by a great variability in their size; all tlie rays
are of the same diameter and sharply pointed, slightly curved
or straight. In one part of the spicules the rays are of tlie
same length, 0,2—0,3 mm, in another one of the rays is much
longer than tlie lateral rays, the proportion between their
length being 2:1. These spicules are the niost numerous in
this species.
The dennal acerate spicules (Plate 22, fig. 14). Straight, sharply
pointed and a little projecting from the outer suriace; their
length not exceeding 2 mm.
The linear acerate spicules of tlie peristome (Plate 22, fig. 15).
These spicules are very slender and straight, their length not
more than 2,5 mm.
The gastric acerate spicules (Plate 22 fig. 16) are very minute,
being only 0,09 mm in length, and having near one of tlie points
a small inflation. Most of these spicules are microspined along
the inflated point.
Colour. When alive, light grey; when dried, pure white.
Halitat. Pitlekai, depth 12 fathoms (1015, 1035, 3036 V.).
Genus Sycandra H.
Sycandra arctica H.
Sycandra arctica, Hseckel, Die Kalkschwämme, II, pag. 353, III, Taf. 55,
Fig. 1 a—1 v, Taf. 60, Fig. 15.
In tlie collection of arctic sponges, gathered during the
Swedish expeditions above-mentioned, there are several specimens
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