VEGA-EXPEDITIONENS VEVENSKAPLIGA ARBETEN. 439 
The acerate spicules (Plate 24, fig. 29). The spicules of this 
kind are more or less disposed in nets or fasciculated; they 
åre usually straight, rarely slightly curved at the middle, 
tapering from the middle towards the short-pointed termina- 
tions. The length is about 0,4 mm. 
The tricurvate spicules (Plate 24, fig. 30) are numerous and 
agree well with those of Desmacella pumicea Fristedt"); they 
are of a comparatively great diameter, more or less curved at 
the middle and at the points. 
The minute C-formed acerate spicules (Plate 24, fig. 31). These 
spicules are very minute, only 0,01 mm in length between the 
two terminations. They are very numerous both in the dermis 
and in the inner parts. 
Colour. Yellowish grey, when dried or preserved in spirit. 
Habitat. North-east from the eastern Taimur-peninsula, 
Hars6; 52, Long: 116745, depth. 30.fathoms (39 V:); Greenland, 
År 
ara N. Lone 1325 W., depth 120 fathoms (576 5.) 
Genus Desmacella OS. 
Desmacella rosea n. sp. 
Plate 24, fig. 32—35, Plate 28, fig. 13. 
This sponge is. represented by a very fine specimen from 
the east-coast of Greenland. 'The: form. is leaf-like. The 
surface is uneven and hispid when the dermal membrane is 
absent, otherwise smooth. The dermal membrane is thin, pel- 
lucid, only attached to the other sponge-body by fine fibres 
formed by the dermis in the following manner. The dermis 
is furnished with numerous funnel-like depressions, which by 
degrees are closed, forming a fibre. The oscula and pores are 
minute, dispersed. The consistency is rather firm. 'There are 
in the collection several broken specimens, all from the same 
locality and probably pieces of only one specimen. The 
largest is 50 mm in length, 40 mm in breadth and 8 mm in 
thickness. 
+) RK. Fristedt, Bidrag till kännedomen om de vid Sveriges vestra kust 
lefvande Spongie (in Kongl. Sv. Vet.-Akad. Handl., Bd 21, N:o 6, pag. 29, 
Tafl. 2, fig. 9 a—9 d). 
