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TWCENG SA EX PSD en O ENGFENTS (RV ETS EINES AR RE IR G VAN CA NN TR EDB UESEDRIEEN:. 42 
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 
aAboutrö mm. Cbhere are greater, but not so typical specimens 
in the collection. The dermis is thin, translucent. The sur- 
face is smooth and even, like that of Amorplina panicea Pallas 
(0.5.:). Oscula few, dispersed, variable in size, generally placed 
laterally. 
The skeleton consists of acerate spicules, not exceeding 
Os mm mn dength, 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- 
gsrey, a few of them yellowish grey or rarely yellow, all the 
specimens being preserved in spirit. 
Habitat. West from the Kamenni-islands, depth 19 fathoms 
(21 VI; im the mouth of Chatanga Bay, depth 15 fathoms (41 V-); 
Norr trom: the mouth of Olenek) Lat. 15 447 Long. f21720 
(47 V. [the specimens from this locality and stat. 1035 V. are of 
a lighter colour than the other specimens)); S. E. from Liakov- 
island, depth 38—9 fathoms (53—54 V.y); Jrkaipij (Northceape of 
Siberia), depth 3—6 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 remeroides Fristedt in several respects as in the 
size and form of the spicules etc.; but, shape and colour apart, 
they may, however, easily be distinguished from each other by 
the structure of the dermal membrane. Amorphina grisea F'ri- 
stedt has the dermis well developed with horizontal spicules, 
while the dermis of Amorphina remieroides only with difficulty 
can be separated from the other body of the sponge, the 
