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very fragile. Oscula tolerably small, dispersed. The colour is
nut-brown or blackish-brown.
Habitat. Spitzbergen, Yaigat-islands, Lat. 79° 20’ N., Long.
19° 5’ W., depth 60 fathoms (Sp.; the number of the stat.
un-known).
Esperia lingua Bow. (O. S.).
Hymeniacidon lingua, Bowerbank, Mon. Brit Spong., II, pag. 187.
Raphiodesma lingua, id. ibidem, III, Plate 47, fig. 8 and Plate 77.
Esperia iingua, O. Schmidt, Grundziige einer Spongienfauna des Atl. Geb.,
pag. 76.
There is no difference between the arctic specimens of this
species and specimens from the west-coast of Sweden and
Norway. The specimens are large and formless, the largest
being about 120 mm in length, and only a little smaller in
breadth. The thickness is 40 mm. The colour is vellow.
Habitat. Greenland, Lat. 61° 15’ N., Long. 49° 11’ W., depth
70 fathoms (56 S.); Lat. 59° 33’ N., Long. 43° 25’ W., depth 120
fathoms (576 S.).
Esperia Iingua Bow. (O. S.) var. arctica n. var.
Plate 25, fig. 20—24, Plate 29, fig. 18.
At first I was doubtful, whether I should regard this
variety as a true species distinet from Esperia Iingua Bow.
(O. S.), or as a variety. But there is so great a resemblance
between our new variety and Esperia Iingua Bow. (O. S.), that
I at last decided to regard our specimens only as a variety.
The sponge is incrusting hard objects, as worm-tubes, stones,
shells ete. The surface is smooth, furnished with numerous
knolls. Oscula are small, dispersed. The consistency is fragile
as in Esperia Iingua Bow. (O. S.). The largest specimen is 50 mm
in length, 30 mm in breadth and 25 mm in thickness. The
knolls are about 3 mm in hight and of the same diameter.
Skeleton. The skeleton consists of acuate spicules, of
linear acuate, of inequiancliorate spicules of two kinds and of
bihamate spicules.
Bd IV. 29
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