418 
THE VOYAGE OE H.M.S. CHALLENGER. 
Genera. 
1, Tethya, Lamarck, 
2. Columnitis, 0. Schmidt. 
3. Xenospongia, Gray (?). 
4. Magog, n. gen. (?). 
Demus II. Spiraspinthaea. 
Spintharophora in which the microsclere is some form of spiraster. 
Family I. Scolopida:. 
The ectosome is a thin fibrous cortex, containing oxeas and microxeas closely 
and radially arranged. The megascleres are oxeas, mostly collected in fibres, radially 
arranged. The microsclere when present is an amphiaster. 
Genera. 
1. Scolopes, n. gen., type — Scolopes moseleyi, n, sp. 
2. Stylocordyla, Wyville Thomson. 
Family II. S u b e r i t i d a: (0. Schmidt). 
The ectosome is a more or less distinctly differentiated cortex, with a skeleton of 
microstyles radially arranged, palisade fashion. Microscleres are usually absent (except 
microstyles) ; in two species — Suberites ficus (Bowerbank) and Suberites virgultosa 
(Bowerbank),^ which are possibly identical, a centrotylote microstrongyle occurs. The 
megascleres are tylostyles. 
Genera. 
1. Suberites (Nardo), Ridley and Dendy, loc. cit., p. 197. 
2. PolynwLStia (Bowerbank), Ridley and Dendy, loc. cit., p. 210. 
3. Proteleia, Ridley and Dendy, loc. cit., p. 214. 
4. Trichostemma, Sars, Ridley and Dendy, loc. cit., p. 216. 
5. Tentorium, Vosmaer, Ridley and Dendy, loc. cit., p. 221. 
6. Quasillina (Norman), Ridley and Dendy, loc. cit., p. 225. 
7. Cliona (Grant), Ridley and Dendy, loc. cit., p. 227. 
^ Bowerbank, Mon. Brit. Spong., vol. iii. pis. xxxv., xxxvi. 
