438 FRISTEDT, SPONG ES. 
Tethya cranium Lmk. 
Tethea cramum, Bowerbank, Mon. Brit. Spong., II, pag. 83, III, Plate 14, 
fig. 1—6. 
This species is represented by three specimens, all dredged 
up during the expedition to Greenland in the year 1883. The 
largest is ovoid, the greatest diameter being 40 mm and the 
smallest 30 mm. Both the outer form and the spicules agree 
perfectly with Bowerbank's description of the species and 
with examples from the Norwegian coast. 
Habitat. East-coast of Greenland, depth about 350 fathoms 
(500 8.); West-Greenland, Lat. 65? 15', Long. 53? 30, depth 75 
fathoms (506 S.); West-Greenland, Lat. 75? 26 N., Long. 67” 
27 W., depth 260 fathoms (542 5S.). 
VIL. Desmacidine 0. S. 
Genus Gellius Gray. 
Gellius arcoferus V osm eer.") 
Plate 24, fig. 29—31, Plate 28, fig. 16. 
Gellius arcoferus, Vosmer, The Sponges of the » Willem Barents» Exped. 
1880—1881, pag. 29, Plate 4, fig. 18--19, Plate 5, fig. 87 —90. 
During the Swedish arctic expeditions there were dredged 
up two specimens of this species, one of which is well pre- 
served, the other broken into small pieces. The sponge is 
variable in form. The greatest specimen is cake-like, round, 
the diameter about 90 mm. The surface is smooth or slightly 
hispid. ÖOscula numerous, dispersed. The consistency is very 
fragile. The sponge grows probably freely in sand or clay. 
Skeleton. The skeleton consists of acerate spicules, of 
tricurvate spicules and of minute C-formed acerate spicules. 
=) Not until the printing of this treatise had commenced did the author 
obtain the above mentioned work of Vosmeer. Consequently figures and 
detailed descriptions of this species and of Artemisina suberitordes — although 
already accurately described by Vosmer — have been given here. 
