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THE VOYAGE OE H.M.S. CHALLENGER. 
slender, curving outwards and forwards, so as to give a cup-like outline to the cladome, 
sometimes reduced to tubercles. 
II. Microscleres (?). 
Habitat . — Coast of Algiers. 
Remarks . — From the character of the plagiotrisene I suspect this may prove to be a 
Stryphnus. 
Ancorina individuosa, 0. Schmidt. 
Ancorina individuosa, 0. Sch., Spong. Atlant. Gebiet., p. 67, 1870. 
Genus (?). 
Stelletta fibulifera, 0. Schmidt. 
Stelletta fibulifera, 0. Schmidt, Archiv f. mikrosk. Anat., vol. xviii. p. 280, 1880. 
Sponge. — Irregular, amorphous. 
Spicules. — I. Megascleres. 1. Strongyle, comparatively large. 2. Strongyle, very 
fine, slender. 3. Trisene, with simple cladi. 
II. Microscleres. 4. “hooks like those of the Desmacidinae.” 5. Euaster, 
“ stellates with conical actines.” 6. Spiraster {?). 
Habitat . — Gulf of Naples. 
Remarks . — One cannot avoid the suspicion that some error must have vitiated 
Schmidt’s description ; such a remarkable complement of microscleres occurs in no other 
known sponge, and considering the frequency with which sponges incorporate the 
spicules of other species, it would appear probable that this is either a Stellettid in 
which sigmas, or a Tetillid in which asters, are accidentally present ; the former is the 
more probable alternative. 
Species which have been removed from the Family Stellettid.e. 
The following species are referable to the genus Erylus of the family Geodiidae : — 
Stelletta discophora, 0. Sch., Spong. Adriat. Meer., p. 47, 1862. 
Stelletta mammillaris, 0. Sch., Ibid., p. 48, and Suppl., iii. p. 20, 1868. 
Stelletta euastrum, 0. Sch., Spong. Adriat. Meer., Suppl., iii. p. 20. 
Stelletta intermedia, 0. Sch., Ibid., p. 21. 
Stelletta transiens, Weltner, Inaug. Diss., p. 44, 1882. 
The following species is referable to the subfamily Geodina of the family Geodiidse. 
Stelletta geodina, 0. Sch., Spong. Adriat. Meer., Suppl., iii. p. 20. 
