PORIFEKA OF THE L.M.B.C. DISTRICT. 197 



In sections prepared without staining the pigment-cells 

 have preserved almost their natural colours. 



The only acknowledged species of Halisarca is the well- 

 known cosmopolitan Halisarca dujanlud. It has been re- 

 described and figured (after Schulze) by Lendenfeld,* but 

 there seems to be a good deal of difference between it and 

 H. ruhra. In N. dxjardini 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, Lendenfeld (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 Hcdisarca. 

 The one is Halisarca ruhitingens, C, f 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 is Halisarca 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." Evidently in both of Carter's 

 species the pigment is placed in the ectoderm, and 



* R. V. Lendenfeld, "A ^lonograpli of the Horny Sjtonges," p. 728, PI. 

 50, fig. 2. 



t Carter, "Annals and Magazine of Xatural History," 5tli ser., vol. vii., 

 p. 366. 



+ Carter, loc. cit., vol. viii., }>. 247. 



