426 FRISTEDT, SPONGES. 
spicules of this last-mentioned species being oblique or rect- 
angular towards the surface. 
This difference in the structure of the dermis as well as 
inthe net-work of the spicules may, I. hope, be a socdd 
characteristic for distinguishing the two genera Amorphina and 
Remera, the species ÅA. remnieroides thus being a connecting lenk 
between the genera. | 
Amorphina fibrosa n. sp. 
Plate Of mms 
This sponge forms irregular masses, incrusting stones, 
bryozoons, sea-weeds etc. The surface is smooth and even. 
Oscula are few in number, not large. The consistency is firm 
owing to the fibres being tolerably well developed. 
Skeleton. 'The skeleton consists of long acerate spicules. 
The acerate spicules (Plate 24, fig. 11, 12) are slightly curved, 
tapering from the middle to the sharp-pointed terminations, 
the length varying from 0,5 to 0,9 mm; the latter size being 
the most common. The spicules are congregated into long 
fascicules or irregularly dispersed. 
Colour. "The colour of specimens preserved in spirit is 
dark-brown. 
Habitat. Behring Strait, Lat. 65? 14' N.:, Long. 171” W., depth 
23 fathoms (1054 V.). 
Genus Humastia 0. S. 
Eumastia sitiens O. 5. 
Plate 24) mr klar TS 
FHumastia sitiens, O. Sehmidt, Grundz. einer Spong.-Fauna des Atl. Geb., 
NaG. AA len I IG. MA 
This species is represented by several well preserved and 
very fine specimens. The form varlies much, according to the 
objects, to which it is attached. But all the specimens are 
furnished with the characteristic, large cloacal fistulae, which 
are free at the distal extremities, but coalesced at the lower 
parts. The surface: 18: smooth. The manner structure fömtve 
