Sijnojms of the Austr-dian Calcarea Heterocoelc. 107 



lum and strongly hispid surface. The largest specimen .in 

 the collection is about 40 mm. high by 4 mm. in greatest 

 diameter, the wall of the sponge being only about O'oG mm. 

 thick. The canal system closely resembles that of G. sacca, 

 but the chambers are shorter and less branched. Tlie skele- 

 ton is arranged as in G. sacca, but the dermal tufts of oxea 

 are less definite and less regularly aiTanged, and the tubar 

 skeleton is composed of much fewer joints. The spiculation 

 is as follows:— (I) Gastral quadriradiates ; very rare, with 

 short apical ray. (2) Gastral triradiates ; strongly sagittnl, 

 with very long and slender rays ; gradually sharp-pointed •, 

 basal ray straight, about 0-3 by O'OOSS mm. ; oral rays 

 straight or slightly crooked, often unequal in length, about 

 0-2 by 0008 mm. " (3) Subgastral sagittal triradiates ;_ oral 

 rays widelv extended, slightly recurved, sharply-pointed, 

 about 0-12'by 0-0082 nun. ; basal ray long, straight, sharp- 

 pointed, varying in length up to about 0-3 mm., and about as 

 thick as the orals, extended in a centrifugal direction through 

 the chamber layer. (4) Tubar triradiates, resembling the 

 foregoing, with similar very long basal rays. (5) Subdermal 

 sagittal triradiates ; with veiy widely extended oral rays 

 lying in the dermal cortex, and long straight basal ray 

 extending inwards through the chamber layer ; oral rays up 

 to about 0-2 by O'Ol mm. ; basal ray up to about 0-32 by 

 001 mm.; all sharply-pointed. (6) Dermal triradiates; 

 sagittal, resembling the foregoing, but often very irregular 

 and with shorter basal ray. "(7) Dermal oxea; long, straight 

 or slightly curved, spindle-shaped, gradually sharp-pointed 

 at each end, length variable, up to about 07 by 0-UlG mm. in 

 the largest specimen, but much longer and slenderer in one of 

 the smaller ones. The spicules of the oscular fringe do not 

 <lifFer markedly from these. 



Locality.— i^ em- Port Phillip Heads (Station 9, coll. J. B. 

 Wilson). 



57. Gmnte.ssa j^oculum, Polejaeff, sp. 



AmijhorisciDi pocidum, Polejaeff. Report on the Calcarea 

 of the Challenger Expedition, p. 46. 



Hetero^na patulosculifera, Carter. Annals and Magazine 

 of Natural History, July 188G, p. 49. 



A. careful examination of portions of Carter's and 

 Polejaeff 's type specimens from the British Museum has 

 convinced me that the two are specifically identical, and 



