Sponges from South Australia. 211 



Lastly I would allude to the following variety of Halisarca 

 australiensis in Mr. Wilson's collection from " Port Western," 

 which might be designated 



Halisarca australiensis , var. arenacea. 



It is much lighter in colour than the rest, owing probably 

 to the presence of quartz-sand, with which it is abundantly 

 charged, thus affording another instance of what occurs in 

 Gummina gliricauda, Sdt., &c., whose consistence, viz. that 

 of soft caoutchouc or india-rubber, is similar to that of Hali- 

 sarca australiensis (see my paper on the Carnosa, ojl>. et loc. 

 cit. p. 248, respecting this sand in the Halisarcida). 



Chondrilla nucula, Sdt. 



I have already alluded to the specimen of this species which 

 came from "Port Phillip Heads "('Annals,' ^.c.),in the descrip- 

 tion of which, however, the size of the globostellate spicules, 

 which I now find to average 4-6000ths in. in diameter, is not 

 mentioned. This is the size also of the globostellates in two 

 other specimens from " Port Western," one of which, growing 

 upon and half imbedding large fragments of mussel-shells, is 

 4^ in. long by 1^ in. in diameter more or less, being irregularly 

 cylindrical in shape, and bearing the usual minute papillee 

 charged with globostellates on its surface ; varying in size 

 under 1-1 60th in. in diameter, and about the same distance 

 apart. 



Chondrilla secunda, Lendenfeld. 



Chond7-ilIa secunda, Lendenfeld, Proc. Linn, Soc. N. S. Wales, yol. x. 

 pt. i. p. 161, figs. 10-12. 



Specimen flat or only slightly convex ; sessile throughout ; 

 growing on the calcareous test of a Polyzoon. Colour light 

 yellowish brown. Surface even, smooth, like glass, minutely 

 granulated. Pores plentifully scattered over the surface. 

 Vent single, situated towards one end of the specimen. 

 Structure internally consisting of a brownish, pulpy, elastic 

 tissue, surrounded by a thick, rigid, cartilaginous cortex, 

 through which (in the vertical section) the pores may be seen 

 to descend, increasing in size towards the usual interlobular 

 lacunose crevices of the body. Spicule of one kind only, viz. 

 globostellate, of different sizes under 18-6000ths in. in dia- 

 meter, whose spines may be sharp-pointed or obtuse. Chiefly 

 aggregated towards the surface, where, together with a great 

 number of pigment-cells, they respectively add to the consist- 



