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at the margins, forms a piece, 45 mm in length, 25 mm in
breadth and about 5 mm in thickness. The surface is smooth,
not furnished with the characteristic m ammui*. Oscula
incon-spicuous. The consistency firm.
The skeleton consists of spinulate spicules.
The spinulate spicules (Plate 24, fig. 21) are furnished with
a great head. Sometimes the spicules are bi- or tri-spinulate;
they are straight or slightly curved, sharp-pointed. The length
is variable, not exceeding 1 mm.
Colour. The sponge is ash-grey, when preserved in spirit;
lighter, wThen dried.
Habitat. The east-coast of Greenland, depth 130 fathoms
(580 S.).
Genus Radiella O. S.
Radiella spinularia Bow. (O. S.).
Tetliea spinularia, Bowerbank, Mon. Brit, Spong., II, pag. 94, III, Plate 15,
Fig. 23—30.
Radiella spinularia, O. Schmidt, Atl. Spong., pag. 76.
Of this species we have only one specimen, obtained
during the above-mentioned expedition. This specimen is
round, compressed, and perfectly agrees with the Swedish ones
iu outer shape, colour, and inner structure. In the middle of
the upper surface, there is one very small mammula; the
marginal parts are darker than the other parts around the
mammula. The greatest diameter of the specimen is about
25 mm, the thickness at the middle 8 mm, tapering towards
the margin.
Habitat. The east-coa^t of Greenland, depth 130 fathoms
(580 S.).
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