ee ee a 
PORIFERA OF THE L.M.B.C. DISTRICT. 197 
In sections prepared without staming the pigment-cells 
have preserved almost their natural colours. 
The only acknowledged species of Halisarca is the well- 
known cosmopolitan Halisarca dujurdini. It has been re- 
described and figured (after Schulze) by Lendenfeld,* but 
there seems to be a good deal of difference between it and 
HI. rubra. In H. dwardini the cavities of the canal system 
are not distinct from the subdermal cavities, and the 
flagellated chambers are irregularly tubular and branched. 
It may be that my new species belongs to the genus 
Bajulus, Lendentfeld (loc. cit. p. 724), in which there are 
distinct subdermal cavities and regularly oval flagellated 
chambers. 
Although none of Carter’s species of Halisarca have been 
acknowledged by Lendenfeld, still it ought to be remem- 
bered that Carter described two red species of Halzsarca. 
The one is Halisarca rubitingens, C,+ from the Gulf of 
Manaar. Carter describes it as ‘‘ amorphous, indefinitely 
spreading and agglomerating together everything in its 
course, at the same time that the whole is tinged externally 
by its red colour, appearing in the form of a thin mem- 
brane when stretched across cavities, composed of poly- 
gonal divisions (cells) in juxtaposition, filled with granular 
contents in which the pigment is situated.” ‘The other 
red species 1s [/alisarca cruenta, C., | from the Gulf of Suez. 
Carter says about its colour: “crimson colour of the sur- 
face, which is seated in an extremely thin cuticula, fading 
off into grey internally.” Hvidently in both of Carter’s 
species the pigment is placed in the ectoderm, and 
* R. v. Lendenfeld, ‘‘ A Monograph of the Horny Sponges,” p. 728, Pl. 
50, fig. 2. 
+ Carter, ‘‘ Annals and Magazine of Natural History,” 5th ser., vol. vii., 
p- 366. 
+ Carter, loc. cit., vol. vili., p. 247. 
