30 Proceedings of the Royal Society of Victoria. 



Myxil/a isodictyalis, Carter, sp. 



Halicho)idria isodictya/is, Carter, A.M.N.H., April, 1882, p. 

 285, pi. xi, tig. 2. 



Halichondria isodictyalis. Carter, A.M.N.H., January, 1886, 

 p. 52. 



Halichondria incrusians, Coll. Brit. Mus. 



The sponge is massive, sessile, usually with more or less 

 conulose surface and rather large scattered vents. The skeleton 

 is an isodictyal network of smooth styli, with tylota radiating in 

 whisps towards the surface and scattered in the dermal mem- 

 brane. The microscleres are small isochelse and sigmata. 



J^.N. 690 (s. 7); 773 (Sorrento Jetty, "wax yellow"); 778 

 (Sorrento Jetty, "wax yellow"); 793 (Sorrento Jetty, "dull 

 wax yellow"); 872 (s. 5); 886 (s. 9); 897 (s. 10); 953 (s. 6); 

 965 (s. 6). 



B.M. d. 103 (labelled " Halichoiidria incriestans" which is 

 explained by Mr. Carter's remarks ioc. cit., Eeg. 86-12-15-391). 



Myxilla victoriana^ n. sp. 



Halichondria pustiilosa, Carter, A.M.ISI.H., December, 1886, 

 p. 450. 



Halichondria pustiilata. Coll. Brit. JSIus. 



Not Halichondria pustulosa. Carter, A.M.N.H., April, 1882, 

 p. 285, pi. xi., fig. 1. 



Massive, irregular, witli uneven, rugose or warty surface and 

 scab-like pore-areas. Vents small and scattered. Texture fairly 

 compact, but soft and spongy. Pale yellow in spirit. 



Skeleton, the main skeleton is an irregular reticulation of 

 spicular fibres, with rather strongly-developed multispicular 

 primary lines running towards the surface. The fibres contain 

 a considerable quantity of pale-coloured spongin, and are abun- 

 dantly echinated by the spined styli. The dermal skeleton 

 consists of the slender diactinal spicules (sometimes stylote) 

 radiating in whisps at the surface, and especially developed in a 

 beautifully radiate manner around the scab-like pore-areas. 



Megascleres, {a) Main styli, smooth, slightly curved and 

 gradually sharp-pointed, sometimes with a faint indication of 

 spination at the base ; size about 0-2 l)y 0-0082 mm. ; {b) Echin- 



