278 Mr. H.J. Carter on 



ence and dark colour of the cortex produced by the latter. 

 Size of specimen ll-12ths x 7-12ths in. horizontally and 

 4-12ths in. high in the centre. 



hoc. Port Western. 



Ohs. To this variety of Ghondrilla nucula Dr. v. Lendenfeld 

 has given the above name. My specimen does not appear to 

 contain the smaller stelliform spicules which he has repre- 

 sented {I. c). 



Chondrilla papillala^ Lend. 

 Cliondrilla papillata, Lend. op. et he. cit. p. 153, figs. 13-16. 



Specimen irregularly elliptical, flattish, convex, contracted 

 towards the base, which had been attached to the calcareous 

 test of a Polyzoon. Colour greenish or greyish stone. Sur- 

 face papillated over the upper part, becoming smooth beneath ; 

 papilla? hemispherical, in strong relief, in juxtaposition, and 

 averaging l-66th in. in diameter at the base, smooth and 

 slippery, but minutely granulated. Pores on the surface, not 

 well seen. Vents three in number, situated respectively in 

 the deep, puckered, crevice-like depressions usually present, 

 as before stated, on the surface of such sponges, the largest 

 presenting at the bottom a cribriform structure that repre- 

 sents the openings of several excretory canals which empty 

 themselves at this point. Structure internally consisting of 

 a thick rigid cortex, about l-48th in. in diameter including 

 the papillse, surrounding a lighter-coloured, elastic, pulpy 

 tissue, presenting the usual crevice-like lacunose vacuities, 

 decreasing in size towards the circumference, where they 

 become subdivided and thus end in the pores. Spicule of 

 one form only, viz. globostellate, in which the spines are 

 pointed, globostellate, comparatively small, averaging 4- 

 GOOOths in. in diameter ; chiefly congregated in the papilla^,, 

 where they form the granulated surface, and, together with an 

 abundance of pigmental cells, add respectively to the consist- 

 ence and colour of the cortex. Size of specimen about 4-12ths 

 X 7-12ths in. horizontally, and 4-12ths in. high. 



Loc. Port Western. 



Obs. In this specimen also I did not see any of the stelli- 

 form spicules represented by Dr. v. Lendenfeld, although 

 there can be no doubt that it is the same species as that which 

 lie has described and illustrated under the above name. 



As regards the diameter of the " globostellates " in diflfe- 

 rent species of Cliondnlla^ I find that in C nucula^ Sdt., it 

 is 7-6000ths; in G. australiensis, Cart., 7-6000ths; in the 



