100 Froceediri<js of the Royal Soeietij of Vicforia. 



3!). Leucaiuira lohata, Carter, sp. 



Leuconia lohata, Carter. Annals and Magazine of Natural 

 History, August 188{i, p. 14o. 



Loealiti/.—^eaY Port Phillii) Heads (Carter). 



40. Laacajuhxi compacta, Carter, sp. 



Leuconia compacta, Carter. Annals and Magazine of 

 Natural History, August 1886, p. 144. 



Locallfi/.—Neav Port Phillip Heads (Carter). 



41. Leucandra ■phUlipensls n. sp. 



The single specimen in the collection is a solita)-y, sessile, 

 irregularly sac-shaped sponge, with a constricted terniinal 

 osculum provided with a feebly developed oscular fringe. 

 The outer surface of the sponge is slightly hispid and the 

 wall of the sponge is ratlier thin, enclosing a wide gastral 

 cavity. The height of the spoiige is about 40 mm., the 

 greatest width 20 mm., and the thickness of the wall nearly 

 ;] mm. There is a very thin dermal and gastral cortex. 

 'J'he canal-sj'stem is very typical ; thickly scattered groups 

 of dermal pores lead into wide, more or less lacunar inhalant 

 canals, which penetrate dee]> into the substance of the wall. 

 The exhalant canals are also wide and deep and unite to- 

 gether in groups before opening into the gastral cavity. 

 Between these wide inhalant and exhalant canals the 

 tiagellated chambers are thickly scattered ; these are 

 generally more or less ovoid in shape but onlyaboi.it 0-14 

 mm. in longer diameter. 



The skeleton is rather weak owing to the prevailing 

 slenderness of the spicule-rays, the spiculation being as 

 follows: — (1) Gastral quadriradiates ; usually more or less 

 sagittal ; with very long, slender, straight or neai-ly straight, 

 sharp-pointed facial rays ; the oral angle wider than the 

 paired angles and the oral rays somewhat longer than the 

 basal; oral rays about 04 by O'Ol mm.; basal ray about 0'3 

 by O'Ol mm. The apical ray is straight or slightly cui'ved, 

 conical and finely pointed, measuring about 01 (i by O'Ol nun. 

 These spicules are very abundant and form a thin gastral 

 cortex, the apical rays projecting into the gastral cavity in 

 large numbers. The walls of the larger- exhalant canals are 

 aJso provided with very similar spicules. Near the osculum 

 tlie gastral spicules become much more strongly sagittal and 



