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fistules is very characteristic. The dermis is nearly totallv
free from the inner substance or the kernel. This dermis
is also of a lighter colour than the kernel and more
sarcode-less. I have not seen the oscula, yet they are probably minute
and dispersed. The finest specimen grows freely, probably in
sand or clay, the length being 40 mm, the thickness 25 mm,
and the h eight 50 mm, the cloacal fistuhe included. These
fistulse are slightly compressed, obtuse, the diameter varying
from 2 to 5 mm. The sponge often contains stones, shells and
other hard objects.
The skeleton consits of acerate spicules (Plate 24, fig. 13),
which are straight and sharp-pointed, tapering from the middle.
The length is 0,?—0,9 mm, consequently a little longer than
those of tlie specimen, described by O. Schmidt, tlie spicules
of which are 0,69 mm in length. The colour of the sponge is
yellowish, when preserved in spirit, slightly lighter, when dried.
Habitat. Pitlekai, deptli unknown (1006 V.).; Lat, 65° 10 N.
Long. 169° 50 W., depth 25 fathoms (1054 V.). The colour of
the specimens from the stat. 1054 is darker than those from
stat. 1006.
In the sponge-collection of tlie Zoological State Museum
at Stockholm there are several specimens of this species,
obtained at the west-coast of Greenland during tlie expedition
of the »Ingegerd» and »Gladan» in the year 1871.
Genus Isodictya Bow.
Isodictya Dicksonii n. sp.
Plate 24, fig. 14.
Tliis sponge is, no doubt, nearly allied to Isodictya
infundi-bidiformis L. (Bow.). The only difference exists in the spicules,
which here are only of one kind, acuate, wliile I.
infundibuli-formis has spicules of two kinds, acuate and acerate. The
species is represented by two specimens. One is very large,
fan-shaped, attaclied by a short pedicle to a large stone.
The length of this specimen is 270 mm, the breadth 450 mm.
and the thickness 5 mm, tlie margin being a little attenuated.
The surface and consistency quite as those of Isodictya
in-fundibuliformis. Oscula are numerous, small, dispersed.
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