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Reniera arctica n. sp.
Plate 24, fig. 2.
Three specimens more or less broken represent this species.
The surface is smooth. Oscula are situated in slightly elevated
tubes, and are rounded, 2 mm in diameter. The consistency
is not so fragile as that of the preceding species. The habitus
of this sponge corresponds tolerably well to that of Amorphina
panicea Pallas (O. S.), but there is a great difference both in
the dermis and in the inner structure, especially in the
disposition of the spicules. The sponge is thickly incrusting. Tlie
largest specimen is 40 mm in length, the breadth being 20 mm,
and the thickness about the same.
Skeleton. The skeleton consists of acerate spicules.
The acerate spicules (Plate 24, fig. 2). In this species these
spicules are exceedingly slender, straight and sharp-pointed,
the length being 0,3 mm.
Colour. The sponge is yellowish, when preserved in spirit.
Habitat. Norskö, depth 10 fathoms (the number of the
stat. unknown).
Genus Amorphina 0. S.
Amorphina panicea Pallas (O. S.).
Halichonclria panicea, Bowerbank, Mon. Brit. Spong., II, pag. 229, III,
Plates 39—40.
Amorphina panicea, O. Schmidt, Grundz. einer Spong.-fauna des Atl. Geb.,
pag. 77.
In the sponge-collection of tlie Zoological State-Museum
at Stockholm there are exceedingly numerous specimens of
this common species both from tlie Swedish and Norwegian
coasts, and from tlie arctic regions, excepted those explored
during the expedition of the Vega. The specimen from the
expedition to Greenland in the year 1883 coats tlie greater
part of a large stone. In this specimen the surface is not so
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