VEG A-EXPEDITIONENS VETENSKAPLIGA ARBETEN. LT 
fistules is very characteristic. The dermis is nearly totally 
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 height 50 mm, the cloacal fistule included. These 
fistule 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 0,1—0,9 mm, consequently a little longer than 
those of the specimen, described by O. Schmidt, the spicules 
of which are 0,69 mm in length. The colour of the sponge is 
yellowish, when preserved in spirit, slightly lighter, when dried. 
Fatbner." Pitlekat, sdep i ma knowa (1006 VIF Lat. 65” 10 N: 
Home. 6950 WW. depth 20 fathoms (1054 VI) The colour of 
the specimens from the stat. 1054 is darker than those from 
stat. 1006. 
In the sponge-collection of the Zoological State Museum 
at Stockholm there are several specimens of this species, ob- 
tained at the west-coast of Greenland during the expedition 
of the »Ingegerd» and »Gladan>» in the year 1871. 
Genus Isodictya Bow. 
Isodictya Dicksonii n. sp. 
Plate 24, fig. 14. 
This sponge is, no doubt, nearly allied to Isodictya infundi- 
buliformis L. (Bow.). The only difference exists in the spicules, 
which here are only of one kind, acuate, while I infundibuli- 
formis has spicules of two kinds, acuate and acerate. The 
species is represented by two specimens. One is very large, 
fan-shaped, attached by a short pediele to a large stone. 
The length of this specimen is 270 mm, the breadth 450 mm, 
and the thickness 5 mm, the margin being a little attenuated. 
The surface and consistency quite as those of Isodictya in- 
fundibuliformis. Öscula are numerous, small, dispersed. 
