504 " THETIS " SCIENTIFIC RESULTS. 



(3) Long curved styli ; the base is spiny for about one or two 

 diameters ; the shaft is smooth and terminates in a very acute 

 point. This form of spicule forms the main part of the axial 

 core and also echinates the fibres, as well as projecting through 

 the dermal surface for half or two-thirds their length ; size 07 

 to 1 mm. by 0-015 mm. 



(4) Slender, straight, cylindrical, smooth styli of the fibres, 

 choanosome, and dermal membrane ; size 0*25 to 0-5 by 0'003 to 

 0004 mm. 



Microscleres : — isochelae, these are fairly plentiful in all parts 

 of the sponge ; size 0*02 mm. 



ECHINOCLATHRIA, Carter. 

 ECHINOCLATHRIA MACROPORA, Lendenfeld, sj). 



Plectispa macropora, Lendenfeld, Austr. Mus. Cat. xiii., Sponges, 

 1888, p. 226. 



Echinoclathria macropora, Whitelegge, Rec. Austr. Mus., iv., 

 2 and 5, 1901-2, pp. 35, 117, 212. 



Stations 37, 44, 48, 50. 



Four examples of this species are in the collection ; the largest 

 is about 500 mm. in height and over 100 mm. wide. The sponge 

 consists of a tangled mass of anastomozing branches from 5 to 

 15 mm. in diameter. After full examination 1 feel inclined to 

 regard this form as being quite distinct from Echinoclathria 

 carteri, Ridley and Dendy. 



A U LENA, Lendenfeld. 



AULENA GIGANTEA, var. MICROPORA, Lendenfeld, sp. 



Hahne gigantea, Lendenfeld, Proc. Linn. Soc. N. S. Wales, x., 

 1886, p. 849. 



Aulena gigantea, var. micropora, Lendenfeld, Austr. Mus. Cat. 

 xiii.. Sponges, 1888, p. 230. 



Aulena gigantea, var, micropora, Whitelegge, Rec. Austr. Mus., 

 iv., 2, 1901, p. 118. 



Stations 8, 54. 



Several specimens of this variety are in the collection from 

 Barranjoey and Jervis Bay. The examples do not, however, 

 afibrd any additional characters to those already published. 



