286 Mr. H. J. Carter on 



into monticular elevations or conuli ; filaments respectively 

 fixed to the shell by an expanded base and for the most part 

 nnbranched, that is ending by a single point, wliich may or 

 may not project beyond the dermis ; presenting the usual 

 aplysinoid structure, and the whole about 3-24ths in. long. 

 Pore-areas in the interstices of the dermal reticulation. Vents 

 not seen. Flesh densely charged with the parasitic cell which 

 I have named ^'Palmella spongiarum " (' Annals,' 1878, vol. ii. 

 p. 165). Incrustation about 2-12ths in, tliick, diminishing 

 towards the circumference. Diameter of parasitic cell 1-1^- 

 6000th in. 



Loc. Port Phillip Heads. 



Ohs. This seems to me to be only a variety of my A. nmvus 

 {I. c), in which the dermal sarcode is much less charged with 

 foreign material than in A. ncevus. 



As it is almost entirely composed of the parasitic cell above 

 mentioned, the soft structures of the body are almost as entirely 

 obscured by it, which is the case also with one of the speci- 

 mens of tlie calcareous sponge called Teichonella 'prolifeva^ 

 to whose description I must refer the reader for a more 

 detailed notice of it (^ Annals/ 1886, vol. xviii. p. 147). 



Aplysina cruor. 



Massive, growing over the valve of a Pecten^ supported on 

 erect keratose filaments, based respectively on the shell and 

 subdividing twice or thrice towards the surface into several 

 short branches ; covered by the usual soft fibro-reticulated 

 dermis, which possesses an opaque hhod-red colour. Colour 

 produced by the presence of small oval, granuliferous cells, 

 about 2|-6000ths in. in their longest diameter, filling the 

 triangular spaces left by the juxtaposition of large, circular, 

 nucleated, flat, epithelial cells, about 6-6000ths in. in dia- 

 meter, which form a layer over the fibro-reticulated structure 

 of the surface and from which the smaller pigmental cells are 

 endogenously derived. Pores in the interstices of the dermal 

 reticulation. Vents here and there. Infernal structure con- 

 sisting of fleshy sarcode sup]wrted on erect filaments of kera- 

 tose fibre j filament expanded at the base, more or less 

 branched, as above stated, about half an inch long. Size of 

 specimen about 2 in. square and ^ in. thick. 



Loc. Port Western. 



Ohs. The keratose filaments of this specimen also are remark- 

 able for the presence of a minute branched filamentous alga, 

 composed of concatenated cells, which appears to have entered 

 by the base. 



