110 I'rocccOi iKjs of the lh>ij(i.l Socicfij of Vlcfori'i. 



Go. Vo.smacfoihsi.s laoct'rd, Carter, sp. 



Hetei'opla macerd, Carter. Antials ami Magazine of 

 Natural History, July J 880, p. oO. 



This species is well represented in the collection I have 

 been able to convince myself of the correctness oi the identi- 

 fication by a niinnte comparison of a piece of Mr. Carter's 

 type fi'oni the Britisii Museum. It is remarkable for its 

 densely agglomerated or colonial habit. Specimens may 

 attain a large size, consisting of veiy numerous individuals 

 almost completely fused together, usually in linear series, 

 which are inter-connected by cioss-bars. The oscula are 

 i-aised on conical prominences, and each indicates a separate 

 gastral cavity. The canal system is remarkable. The 

 chambers are thimble-shaped and mostly widely separated 

 from the gastral cavity, with which they conuiiunicate by 

 a strongly developed system of exhalant canals, each being- 

 separated from its exhalant canal by a well developed 

 diaphragm. Those chambers which lie next to the dermal 

 suriace still exhibit a radial arrangement with regard to 

 the long axis ot the individual. Both subdermal and 

 subgastral sagittal trii'adiatcs arc strongly developed. 



Locality. — Near Port Phillip Heads (Cartel', and coll. 

 J. B. Wilson). 



06. Vosmaeropslti (Jepreaaa, n. sp. 



Specimen flattened, cushion-shaped, with flat under and 

 convex up])er surface. About 12 mm. in horizontal diameter, 

 and only 4 mm. thick in the middle. Maigin rounded, 

 i-OLighly cii'cnlar in outline. There is no wide gastral cavit}', 

 but several large, branching exhalant canals converge to a 

 single small osculum situate near the middle of tlie uppei' 

 surface. Sinface smooth ; no distinct oscular fringe. 



The inhalant canal-sy.stem is quite irregulai-, commencing 

 in wide lacunar spaces situated beneath the thin, pore-bear- 

 ing dermal cortex. The flagellated chambers are irregularly 

 but thickl3' scattered throughout the thickness of the sponge, 

 with no trace of radial airangement around a central gastral 

 cavity. They are irregular-ly sac-shaped or thimble-shaped, 

 measuring about 0'2 by 009 mm. 



The bulk of the skeleton is made up of fairly large, sub- 

 regular or slightly sagittal triradiates, scattered witliout 

 definite ordei- throughout the thickness of the sponge, but 

 many with one .slightly longer ray jiointing towards the 



