442 FRISTEDT, SPONGES. 
The bihamate spicules (Plate 24, fig. 41, 42, 43) are both C- 
and S-curved; they are very numerous in the interstitial mem- 
branes. The smallest are only 0,0075 mm. 
In the sponge-body there are numerous gemmules, com- 
posed of minute silver-shining balls. The kernel of the gem- 
mule is darker than the outer parts, and there is a small 
depression like that in the globular spicules of a Geodia Lmk; 
but here, I believe, we have true gemmules. TI have figured 
these gemmules Plate 24, fig. 44, 45. 
Colour. "The colour is light with a tint of yellow. 
Habitat. East-coast of Greenland, depth 130 fathoms (580 5-). 
Genus Desmacidon Bow. 
Desmacidon Jeffreysii Bow. 
Desmacidon Jeffreysii, Bowerbank, Mon. Brit. Spong., II, pag. 347, III 
Plate 62, fig. 1—35. 
There are only some small pieces of this sponge, the 
largest about 40 mm in length and breadth; the thickness 6 mm. 
But the form and consistency of these pieces agree so well 
with Desmacidon Jeffreysii Bow., that there can be no doubt 
of our having this species before us, although we do not see 
its spicules, which agree with those figured by Bowerbank: 
Remnants of the cloace are also visible. 
Habitat. East-coast of Greenland, depth 130 fathoms (580 5). 
Genus Hastatus Vosmer sens. lat. Fristedt. 
Hastatus Robertsoni Bow. (Fristedt). 
Halichondria Robertsoni, Bowerbank, Mon. Brit. Spong., IV, pag. 100, 
Plate 5, fig. 3—14. 
Hastatus Robertsonmi, Fristedt, Bidrag till kännedomen om de vid Sveriges 
vestra kust lefvande Spongize (i Kongl. Sv. Vet.- 
Akad. Handlingar, Bd 21, N:o 6, pag. 34). 
This species is represented by several specimens. Both the 
outer habitus and the inner structure agree well with those of 
