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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 Bav, depth 15 fathoms (27 Sp.); Jinretlen.
depth unknown (1006 A7.); Konyam Bav, depth 2—16 fathoms
(1054 V.).
Hastatus ambiguus Bow. (Fristedt).
Microciona ambigua, Bowerbank, Mon. Brit. Spong., II, pag. 136, III,
Plate 25.
Hastatus ambiguus, Fristedt, op. cit., pag. 31, Plate III, fig. la—1 h.
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 from one to two mm.
The spicules agree, without exception, with those figured by
Bowerbank, op. cit.
Habitat. North from Spitzbergen, Lat, 80° 7 N., Long. 16’J
54’ E., depth 60 fathoms (256 Sp.).
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 consistency is fragile.
The skeleton consists of spined acuate. smooth hastate
or obtuse spicules, equianchorate and slender bihamate
spicules.
Tlie spined acuate spicules (Plate 25, fig. 7, 8) are exceedingly
variable in size. The smaller are only 0,i3 mm in length, the
larger 0,3 mm. They have the greatest diameter at the base;
the small are often a little infiated at the base. They are
totally spined and generally curved.
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