Sponges from South Australia. 353 



3. Echinonema pectiniformis, 



Flabelliform, circular, stipitate ; margin almost even ; stem 

 short ; proliferous processes at the base. Consistence hard, 

 compact. Colour, when fresh, '' pale terra-cotta red ;" now 

 the same internallj, but dermis pale brown. Surface even, 

 here and there presenting small elevations. Vents on the 

 elevations, also indicated although not actually seen, on the 

 margin, bj branched depressions marking the course of sub- 

 jacent excretory canals running towards it. Spicules of two 

 forms, viz. : — 1, skeletal, acuate, 60 by l-6000th ; 2, echi- 

 nating, clavate, spined throughout, 9 by l-6000th. Structure 

 uniformly compact. Ovigerous. Size of specimen 8 by 7 in., 

 thickness \ in. 



Depth 20 fath. 



Obs. This and E. jlahelUformis appear to be the same 

 species. 



4. EcMnonema incrustans. 



Massive, incrusting, thick, covering the whole of a Pecten. 

 Consistence firm, resilient. Colour, when fresh, " brick- 

 red," now rich orange. Surface uniformly granulated. Pores 

 not seen. Vents numerous, large, scattered over the surface. 

 Spicules of three forms, viz. : — 1, skeletal, slightly fusiform, 

 abruptly pointed, chiefly in the fibre, 105 by l^-GOOOth ; 2, 

 echinating, acuate, clavate, spined throughout, IS-GOOOths 

 long ; 8, flesh-spicule, equianchorate, naviculiform, 4-6000ths 

 long. Structure compact, sarcode orange-yellow. Size of 

 specimen 2 x 3|- in., f in. thick. 



Depth 11 fath. 



Group Ic, DiCTYOCYLINDEI NA. 



5. Dictyocylindrus pinnatijidus, 



Stipitate, compressed, bunch of cylindrical stalks of various 

 lengths, often divided polychotomously as well as dichoto- 

 mously, terminating in long and short lengths and in sharp 

 points which are sometimes bifid, proliferously plumose or pin- 

 nate in two lines opposite each other, feather-like, for some 

 distance up the branch. Consistence soft, hirsute or velvety 

 on the surface. Colour, when fresh, " dark brown," the 

 same now. Surface uniformly granulated, hispid, the latter 

 more particularly where the dermis has been abraded. 

 Pores and vents not conspicuous. Spicules of three forms, 

 viz. : — 1, skeletal, long, setaceous, acuate, 255 by 3-6000ths ; 

 2, subskeletal, acuate, smooth, averaging 75-6000ths longj 



