VEG A-EXPEDITIONENS VETENSKAPLIGA ARBETEN. 409 
The gastric quadriradiate spicules (Plate 22, fig. 22). All the 
rays are of the same diameter, sharply pointed and curved. 
The apical ray is about 0,7 mm in length, the lateral rays 
reaching a length of 0,2 mm. 
The parenchymal quadriradiate spicules (Plate 22, fig. 21). All 
the rays of these spicules are of nearly the same diameter and 
length, the apical ray a little longer. The length of the rays 
is: 0,,—0,3 mm. "These spicules are not so sharply pointed as 
the gastric quadriradiate. 
The triradiate spicules (Plate 22, fig. 17—20) are as usually 
distinguished by a great variability in their size; all the rays 
are of the same diameter and sharply pointed, slightly curved 
or straight. In one part of the spicules the rays are of the 
same length, 0,2—0,3 mm, in another one of the rays is much 
longer than the lateral rays, the proportion between their 
length being 2:1. These spicules are the most numerous in 
this species. 
The dermal acerate spicules (Plate 22, fig. 14). Straight, sharply 
pointed and a little projecting from the outer surface; their 
length not exceeding 2 mm. 
The linear acerate spicules of the peristome (Plate 22, fig. 15). 
These spicules are very slender and straight, their length not 
more than 2,5 mm. 
The gastric acerate spicules (Plate 22 fig. 16) are very minute, 
being only 0,09 mm in length, and having near one of the points 
a small inflation. Most of these spicules are microspined along 
the inflated point. 
Colour. When alive, light grey; when dried, pure white. 
Habitat. Pitlekai, depth 12 fathoms (1015, 1035, 1036 V-.). 
Genus Sycandra H. 
Sycandra arctica H. 
Sycandra areticea, Heckel, Die Kalkscehwämme, II, pag, 358, III, Taf. 55, 
Fig. 1a—1 v, Taf. 60, Fig. 15. 
In the collection of arctic sponges, gathered during the Swe- 
dish expeditions above-mentioned, there are several specimens 
