VÄRI(GSA SEXIA VIP ET ORNEESNIS EO ED EERNOISERKSARRUDIII GRAN TAR RB YE KITE NG 421 
Reniera arctica n. sp. 
Plate Ao Sa 
Three specimens more or less broken represent this species. 
The surface is smooth. Öscula 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 
ter dermisk and in the mner structure, especially in the dis- 
position of the spicules. The sponge is thickly inerusting. The 
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 (0. 5.) 
Halichondria pamicea, Bowerbank, Mon. Brit. Spong., IT, pag. 229, IIT, 
Plates 39—40. 
Amorplina pamicea, O. Sehmidt, Grundz. einer Spong.-fauna des Atl. Geb., 
198 tl 
In the sponge-colleetion of the Zoological State-Museum 
at Stockholm there are exceedingly numerous specimens of 
this common species both from the Swedish and Norwegian 
coasts, and from the arctic regions, excepted those explored 
during the expedition of the Vega. The specimen from the 
expedition to Greenland in the year 1883 coats the greater 
part of a large stone. In this specimen the surface is not so 
