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Amorphina grisea n. sp.
Plate 24, fig. 10, Plate 27, fig. 10.
Of this species we have numerous specimens from the
arctic regions, and the sponge seems to correspond to
Amorphina panicea Pallas (O. S.) on our coasts. The form is
very variable. There are both formless, coating masses and
arborescent specimens; the branches are in most cases
dicho-tomously divided and slightly compressed; the length of the
most typical specimen is 110 mm; the thickness of the branches
about 6 mm. There are greater, but not so typical specimens
in the collection. The dermis is thin, translucent. The
surface is smooth and even, like that of Amorphina panicea Pallas
(O. S.). Oscula few, dispersed, variable in size, generally placed
laterally.
The skeleton. consists of acerate spicules, not exceeding
0,6 mm in length, part of them being only 0,3 mm. They are
smooth, slightly curved, tapering from the middle to the sharp
points.
Colour. The colour is variable. Most specimens are
ash-grey, a few of them yellowish grey or rarely yellow, ali the
specimens being preserved in spirit.
Halitat. West from the Ivamenni-islands, depth 19 fathoms
(21 V.); in the mouth of Chatanga Bay, depth 15 fathoms (41 V.) ;
North from the mouth of Olenek, Lat. 73° 44’, Long. 121° 20’
(47 V. [the specimens from t-his locality and stat. 1035 V. are of
a lighter colour than the other specimens]); S. E. from
Liakov-island, depth 8—9 fathoms (53—54 V.); .Jrkaipij (Northcape of
Siberia), depth 3—(3 fathoms (68 V.); Pitlekai, depth 12 fathoms
(1016 V.); the same locality, depth 10—14 fath. (1031, 1035 V.).
As may be easily found this species agrees very well with
Amorphina renieroides Fristedt in several respects as in the
size and form of the spicules etc,; but, shape and colour apart,
they may, however, easily be distinguishecl from each other by
the structure of the dermal membrane. Amorphina grisea
Fristedt has the dermis well developed with horizontal spicules,
wliile the dermis of Amorphina renieroides only with difficulty
can be separated from the other body of the sponge, the
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