468 
megascleres, more or less echinated by acanthostyles; spongin very 
scarce; the fibres are running obliquely towards the surface, there 
giving ofF tufts of smooth diactines sustaining the dermal mem- 
brane. Everywhere in the choanosome are scattered smooth mega¬ 
scleres. In the dermal-membrane lie several isochelae, and some- 
times a good deal of acanthostyli arranged tangentially and in one 
layer. The above mentioned walls surrounding the ostia-areas are 
sustained by tangentially arranged smooth diacts, placed so as to 
point towards the centre. 
Spicules. a. Megascleres. 1. Smooth, nearly straight diactines 
(fig. 22 a—b), ca. 320 X5 — 6, variously ended: as strongyla, tylota, 
tornota; sometimes the two ends are so iinlike one another, and 
the one blunt, as not to be distinguishable from styli. 2. Acantho¬ 
styli (fig. 22 c), from ca. 90—180X13—14 /iv, the smaller forms 
very coarsely spined. b. Microscleres. Isochelae (fig. 22 d—e), 
of common form, strongly curved, ca. 26 p. 
The faet that this sponge is found at two distinet localities at 
a comparatively long distance from one another, and in both local¬ 
ities together with the foregoing species, seems to justify the erec- 
tion of the sponge as a distinet species, and not merely as a vari¬ 
ation of the former. 
Myxilla crelloides nov. spec. 
(Fig. 23 a—d). 
2 miles East of North Cape. 55 fathoms. Hard bottom. 2/1.1915. 
One large specimen. Very richly ramose; branches 3—4 mm 
thick, often somewhat flattened, or otherwise a little deviating from 
the purely cylindrical shape; total length of the specimen ca. 230 
mm. Oscules very small and inconspieuous, scattered, rather scarce. 
Surface just a little rough to the touch. Consistence hard but brittle; 
colour (formaline) dirty reddish. 
The skeleton is a dense reticulation of acanthostyles, only very 
faint tentatives to fibre-formation can be seen; meshes often rather 
triangular, the sides built up of one or a few spicules, but only 
of one spicule’s length. Here and there are tylota found irregularly 
distributed; these latter spicules are forming brushes under the 
dermal-membrane; otherwise no special dermal-skeleton is to be 
found; the acanthostyles are even more scarcely distributed in the 
