VEGA-EXPEDITIONENS VETENSKAPLIGA ARBETEN. 413 
The rosette spicules (Plate 23, fig. 10) are the smallest of all 
the spicules of this species, and are rather rare. The rosette 
1s quadriradiate, the arms being smooth, straight, radiating. at 
equal angles from the centre, and terminate with four small 
inflations, to which each of the four very slender, sharply 
pointed and smooth rays is attached. 'The length from the 
centre of the spicules to the point of a ray is 0025 mm. 
Colour. "The sponge is felt-grey, with a tint of rose, when 
'preserved in spirit; light-grey, when dried. 
Habitat. "The east-coast of Greenland, depth 125 fathoms 
(OTIS 
Hyalonema foliata n. sp. 
Plate 23, fig. 12—17, Plate 26, fig. 6. 
This new species is represented by several greater and 
smaller fragments, which all probably appertain to only two 
or at the most to three specimens. Almost all the pieces 
are compressed, blade-like and a little concaved, tending to 
cyathiform; and I have seen one specimen attached to 3 
stone by a short pedicle; this specimen was as the others 
broken in the margins, but I could easily detect its cyathi- 
form shape. 
"The surface is smooth; the consisteney like that of the 
Ppreceding species. The largest specimen is ventilabriform, 
the length about 50 mm, the breadth 30 mm; the thickness is 
the same in all our specimens, not exceeding 3 mm. Oscula 
are minute, numerous, and dispersed; pores inconspicuous. 
The great skeleton-spicules are dispersed without order, and the 
smaller disposed as in Hyalonema rosea Fristedt. The spicules 
of these species agree much with each other, but the small 
rosettes, figured Plate 13, fig. 15, are sufficiently characteristic 
to separate both the species. 
Skeleton. The skeleton consists of spinulate spicules, 
the head being spined; of arcuated obtuse spicules, terminally 
spined; of very large, smooth acerate spicules (all these three 
kinds of spicules agree with those of Hyalonema rosea): of 
rosettes of two kinds, and of hexradiate spicules of three 
kinds. 
