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specimen being 90 mm in length, about G0 mm in breadth and
15 mm in thickness. The species is furnished with very firm
fibres. filled up with the softer membranes. The upper surface
is smooth and even, the lower uneven.
Skeleton. The skeleton consists of acuate spicules, of
small anchorate spicules, larger anchorate (= trenchant bili.)
spicules and very large bihamate spicules.
The large acuate spicules (Plate 25, fig. 33) form the fibres.
They are sometimes slightly curved near the base; their length
is 0,c mm.
The large anchorate spicules (Plate 25, fig. 34, 35) are very
variable in size and form. They are generally 0,i mm in length.
These spicules resemble very much those, named trenchant bili.
by Vos meer, Bowerbank and other authors.
The small anchorate spicules (Plate 25, fig. 36, 37) are true
anchorate ones; their length is only 0,03 mm. They are
equi-ended and more numerous than the preceding kind.
The bihamate spicules (Plate 25, fig. 38, 39) are very large
and exceedingly numerous, the straight length between the
points varying from 0,i to 0,i6 mm. Sometimes one of the ends
is divided into three small points.
Colour. Light-grey with a tint of yellow, when dried or
preserved in spirit.
Habitat. East-coast of Greenland. depth 140 fathoms (581 S.).
Genus Forcepia Carter.
Forcepia groenlandica n. sp.
Plate 25, fig. 40—46.
This species is represented by one specimen from
Greenland, which is thickly incrusting a coral. The sponge is
form-less, massive, the surface being uneven. Oscula are small,
dispersed. The consistency verv fragile.
Skeleton. The skeleton consists of spined acuate
spicules, obtuse spicules, bihamate spicules, equianchorate spicules,
and spined forcepiform spicules.
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