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spicules of this last-mentioned species being oblique or
rect-angular towards the surface.
This difference in the structure of the dermis as well as
in the net-work of the spicules may, I liope, be a good
characteristic for distinguishing the two genera Amorphina and
Reniera, the species A. renieroides thus being a connecting lenk
between the genera.
Amorphina fibrosa n. sp.
Plate 24, fig. 11, 12.
This sponge forms irregular masses, incrusting stones,
bryozoons, sea-weeds etc. The surface is smooth and even.
Oscula are few in number, not large. The consistency is firm
owing to the fibres being tolerably well developed.
Skeleton. The skeleton consists of long acerate spicules.
The acerate spicules (Plate 24, fig. 11, 12) are slightly curved,
tapering from the middle to the sharp-pointed terminations,
the length varying from 0,5 to 0,9 mm; the latter size being
the most common. The spicules are congregated into long
fascicules or irregularly dispersed.
Colour. The colour of specimens preserved in spirit is
dark-brown.
Habitat. Behring St-rait, Lat. 65° 14’ N., Long. 171° W., depth
25 fathoms (1054 V.).
Genus Eumastia O. S.
Eumastia sitiens O. S.
Plate 24, fig. 13, Plate 27, fig. 11.
Eumastia sitiens, 0. Schmidt, Grundz. einer Spong.-Fauna des Atl. Geb.,
pag. 42, Taf. 5 Fig. 12.
This species is represented by several well preserved and
very fine specimens. The form varies much, according to the
objects, to which it is attached. But all the specimens are
furnished with the characteristic, large cloacal fistulae, which
are free at the distal extremities, but coalesced at the lower
parts. The surface is smooth. The inner structure of the
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