192 
THE VOYAGE OP H.M.S. CHALLENGER. 
Stryphnus carbonarius (0. Schmidt). 
Stelletta carhonaria, 0. Schmidt, Archiv f. mikrosk. Anat., Bd. xviii. p. 280, 1880. 
„ „ Weltner, Inaug. Hiss,, p. 52, pi. hi. fig. 42, 1882. 
Sponge. — Massive, irregular, of slag-like appearance. 
Spicules. — I. Megascleres. 1. Oxea. 2. Strongloxea{f). S. Dichotri^ne; ihahdome, 
slender, short. 
II. Microscleres. 4. Oxyaster, actines slender. 5. Sanidaster.^ 
Colour. — Black. Size (?). 
Habitat. — Gulf of Naples. 
Remarhs. — I have not seen specimens of this sponge, but from Schmidt s description 
it would appear to be a genuine Stryphnus; whether identical or not with Stryphnus 
mucronatus, 0. Schmidt, must for the present be regarded as more or less doubtful ; the 
only difference to be gathered from Schmidt’s description lies in the colour, the last- 
named species being puce-brown, according to Schmidt. 
Stryphnus fortis, Vosmaer. 
Stelletta fortis, Vosmaer, Spong. “Willem Barents,” p. 6, pi. iv. figs. 32, 33; pi. v. figs. 48, 
49, 1885. 
Sponge. — Massive ; neither oscules nor wide canals visible ; surface very rough, with 
protruding spicules. 
Spicules. — I. Megascleres. 1. Oxea, large. 2. Plagiotrixne, rhabdome frequently 
only twice the length of the cladi. 
II. Microscleres. 3. Oxyaster, comparatively large. 4. Amphiaster, small. 
Colour . — Brownish-red. 
. Habitat. — Lat. 71° 55' N., long. 20° 31' E. ; depth, 179 fathoms. 
Remarhs. — Vosmaer compares this species with Ecionema compressa, Bwk,, which, 
however, is really a Poecillastra. It is true Poecillastra and Stryphnus appear to be 
allied through the genus Characella ; but Yosmaer’s description, though inadequate for the 
determination of species, owing to the absence of measurements, can leave no doubt as to 
the generic characters of the species he had under observation ; it is clearly a Stryphnus, 
and closely allied to Stryphnus {Ecionema) ponderosus, Bwk. Perhaps this is the 
species to which Vosmaer intended to allude. Still closer probably are its affinities to 
Stryphnus rudis from Norway. 
1 See Weltner, loc. cit., pi. ill. fig. 42. 
