Catalogue of Non-Calcareoiis Sponges. 19 



Sub-genus Fsendohalichoiidria, Carter. 



Differs from Esperiopsis only in the remarkable spined 

 isochelte. 



Pseudohalichondria clavilobata, Carter. 



Pseudohalichondria clavilobafa, Carter, A.M.N.H., December, 

 1886, p. 454 ; pi. x., tigs. 6-9. 



This remarkable sponge, so well characteinsed by its spined 

 isochelw, appears to be not uncommon in Port Phillip. 



R.N. 446 (s. 9, 17 f ; "ochre-yellow"); 709 (s. 8); 857 (s. 9); 

 966 (s. 6); 986 (s. 9). 



B.M. sp. 38 ('■'■ Pseudohalichondria clavilobata., C. Type;''' Reg. 

 86-12-15-81); d. 14 (wrongly labelled '' Sponge I ia stelliderniata ;" 

 Reg. 86-12-15-287). 



Genus Desniacidon, Bowerbank. 



Megascleres always diactinal, smooth oxea or strongyla. 

 Microscleres isochelse, to which others may be added. 



Desniacidon australis., n. sp. 



Massive, irregular ; with numerous vents scattered on 

 prominent parts. Texture very sandy, sometimes with a dermal 

 layer almost free from sand or with a beautiful minute sandy 

 reticulation on the surface. Internally the sand is arranged in 

 stout radiating columns whose ends may form pock-like markings 

 on the surface. Grey in spirit. 



Skeleton. The spicular skeleton is very nmch reduced, 

 consisting mainly of slender strongyla scattered through the 

 ground substance between the sandy columns and occasionally 

 arranged in loose whisps, especially towards the surface. There 

 may be a well-developed dermal reticulation of broken foreign 

 .spicules. 



Megascleres., slender strongyla, measuring about 0-16 by 

 0-0028 mm. 



Microscleres, (a) very slender tridentate isochelte, about 0*012 

 mm. long, with small teeth ; (b) very slender simple and contort 

 sigmata, measuring about 0-02 mm. from bend to bend. 



P.JV. 303 (18 f ; "dirty buff yellow"); 351 (19 f ; "yellowish- 

 brown, pale"); 532 (x, 19 f; " ochraceous ") ; 762 (s. 1); 929 

 (x A); 951 (s. 8); 999 (s. 1). C2 



