BY REV. J. E. TENISON-WOODS, F.L.S. 291 



Explanation of Plate XIII. 

 Fig. 1. — Hemiaster (Riiynobrissus) apicatus, abactinal system. 



Plate XIV. 



Phyllacanthtjs parvispina, A. test with spines. 



,, ,, B. denuded of spines showing anal 



system. 



On Doris Arbutus, Angas. 



By Reginald Bligh Read, M.R.C.S., Eng. 



[Plate XVII.] 



Branchiae nine, tripinnate, totally retractile, (Angas, from 

 examination of only one small specimen -551 in. by '177 in., 

 thought they were subretractile) united only at base, when 

 extended, the whole assume a melon shape ; at first sight they 

 appeared to be united at the summit, but in the tank under a 

 two-inch object glass x 20 diam., were seen to be totally separate. 



In addition to the only specimen yet found, that by Angas, I 

 have obtained three, and in the same locality, Coogee Bay, the 

 largest of which measured "795 by -374 in. The number of 

 branchiae is not given by Angas. The stem of the tentacle is 

 perfectly transparent, whilst the summit of the tentacle is deeply 

 divided into about 1 1 laminae, coloured white, interspersed with 

 dark brownish spots. A ring of about 24 yellowish, white tipped 

 papillae surrounds each tentacle. The rim of the retractile cavity 

 of the branchiae rises, then these are expanded and on its edge 

 are set numerous tubercles arranged in pairs. Of some other of 

 our JNudibrancMateSf Angasiella Edivardsi, is interesting, being 



