KEY TO THE AUSTRALIAN GENEEA. 249 



(68) Sponge cup-shaped ; fibres stout Kalykenteron, p. 216. 



f vv 



(69) \ 



Without foreign bodies in any of the fibres . . 71 



With foi'eign bodies in some of the fibres . . (72) 



r Sponge ei'ect, lamellar or branched, solid . . Thalassodendron, 



71 i [p. 222. 



I Sponge honejTomb-like Plectispa, p. 225. 



(72) With sand-cortex Clathriopsamma, 



[p. 227. 

 rWith echinating spicules on the superficial 



I fibres and abundant foreign bodies in the 



(36) < skeleton Aulena, p. 228. 



Without echinating spicules, and with only 



V. few foreign bodies in the fibres Hyattella, p. 233. 



(30) I 



Without spiral microsclera Axinella, p. 234. 



With abundant spiral microsclera Spirophorella, p. 236. 



