VEGA-EXPEDITIONENS VETENSKAPLIGA ARBETEN. 443 
specimens from the Swedish coast, which I have examined. 
The largest specimen is about 60 mm in length, the thickness 
and the breadth the same, viz. 30 mm. 
Habitat. Foul Bay, depth 15 fathoms (27 Sp); Jinretlen, 
depth unknown (1006 V.); Konyam Bay, depth 2—16 fathoms 
(1054 V-). 
Hastatus ambiguus Bow. (Fristedt). 
Microciwona ambigua, Bowerbank, Mon. Brit. Spong., II, pag. 136, III 
Plate 25. 
Hastatus ambiguus, Fristedt, op. cit., pag. 31, Plate III, fig. 1 a—1 hb. 
In the collection of arctic sponges of the Zoological State 
Museum at Stockholm there are only three examples of this 
species. All the specimens are incrusting shells of Pecten. 
The thickness of the crusts. varies froms, one to two mm. 
The spicules agree, without exception, with those figured by 
Ibower bank; op... cit. 
abidi, North from Spiizbersen, Lat. 50.0 Ny Long: 167 
54 E., depth 60 fathoms (256 5Sp-.). 
Hastatus foliatus n. sp. 
Plate 25, fig. 7—12. 
Only one specimen represents this species. The sponge is 
broken at the margins, and is probably a small fragment of a 
much larger specimen. The form is leaf-like, 35 mm in length, 
the greatest breadth being 30 mm and the thickness only 3 mm. 
The surface is smooth and even, perforated by numerous small, 
dispersed oscula. The eonsistency is fragile. 
The skeleton consists of spined acuate, smooth hastate 
or obtuse spicules, equianchorate and slender bihamate spi- 
cules. 
The spined acuate spicules (Plate 25, fig. 7,8) are exceedingly 
variable in size. The smaller are only 0,13 mm in length, the 
larger 0,3 mm. They have the greatest diameter at the base; 
the small are often a, little inflated at the base. They are 
totally spined and generally curved. 
