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the greatest diameter at the middle, tapering towards the round
base and the abruptly pointed end. The length is 0,9—1 mm.
The obtuse spicules of the cortex (Plate 25, fig. 57) are always
more or less irregularly curved: one of the terminations is
generally a little infiated; they are microspined, the spines
being exceedingty minute, smaller than in other microspined
spicules which I have seen. The length is 0,i2 mm.
The bihamate spicules (Plate 25, fig. 58) are both C- and
S-curved, the straight length betwTeen the points being 0,02 mm.
Tlie inequianchorate spicules (Plate 25, fig. 59) are not so
numerous as the other spicules of’ the sponge. Their length
is 0,06 mm.
Colour. Yellowish with a tint of rose.
Habitat. East-coast of Greenland, depth 130 fathoms (580 S.).
Cladorhiza nobilis n. sp.
Plate 25, fig. 60—65, Plate 31, fig. 26.
The single specimen, which represents this species, is
very fine and well preserved. It is the most beautiful sponge
from the arctic regions of all the sponges of the Zool.
State-Museum at Stockholm. The shape corresponds well to
O. Schmidt’s and Ha n s en’s figures of Cladorhiza concrescens
O. S.*) and Desmacidon(!) giganteum Hansen**). But these two
species are compact, and our new species is hollow. The length
of the species is 110 mm, the thickness at the middle 10 mm.
The sponge is furnished with 24 branches, which are infiated
at the ends. The length of these arms or branches is about
25 mm, the thickness 2—3 mm; the diameter of the bulbous
inflations is 6 mm. Two of the lower branches and eight of
the upper ones are anastomosing; the others are free. The
surface is even and tolerably smooth, the branches exceedingly
slightly hispid. I have not seen the root of this species. It
was broken off by the dredge.
*) O. Schmidt, Die Spongien des Meerhusen von Mexico, pag. 83.
Taf. 10, Fig. 8—9.
**) G. A. Hansen, Den norske Nordhavsexpedition 1876—78, XIII,
Spongiadse, pag. 14, PL 2, fig. 12—13, Pl. 7, fig. 8.
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