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The acuate spicules (Plate 25, fig. 20) are smooth, generally
slightly curved, the greatest diameter being at the middle,
tapering towards the base and the pointed end. These spicules
are the most numerous in the sponge. The length is 0,35 mm.
The linear acuate spicules (Plate 25, fig. 21) are not so
numerous as the preceding ones. They are always straight
and very slender, the length varying from 0,2 to 0,25 mm.
The inequiancliorate spicules (Plate 25, fig. 22, 23) are of two
sizes plainly distinet from eaeli other. The larger spicules are
disposed in rosettes as those of Esperia lingua Bo av. (O. S.), the
spicules in the rosettes being fewer in the variety. The length is
0,08—O.i mm. The smaller inequiancliorate spicules are disposed
without any order; the length of them is only O.025—0,03 mm.
The lihamate spicules (Plate 25, fig. 24) are C-curved, the
straight length between the points 0,os mm.
Colour. The colour is yellow.
Habitat. Behring-islands, depth 5—10 fathoms (1078 V.).
Esperia helios 11. sp.
Plate 25, fig. 25—29.
Only one specimen represents this species. This specimen
is rounded and as large as a hazel-nut, The surface is hispid
on account of projecting fascicules of spicules. Oscula minute,
dispersed; the consistency is tolerably firm. The sponge is
groAving freely.
The skeleton consists of acuate spicules, of
inequi-anchorate and bihamate spicules.
The acuate spicules (Plate 25, fig. 25) form the greater part of
the skeleton; they are disposed without any order. They are
sometimes subspinulate and often slightly curved. The length
is 0,35 mm.
The inequiancliorate spicules (Plate 25, fig. 26, 27). These
spicules are only of one kind, 0,os mm in length. They are ali
congregated in rosettes as those of Esperia lingua Bow. (O. S.).
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