4 Messrs. J. Wood-Mason and A. Alcock on 



exumbral coronal furrow, with an entire {%. e. not indented) 

 margin — in this respect differing from Atolla Wyvillii, 

 Haeckel, and from Atolla Bairdii, Fewkes. 



In both the edges of the marginal lobes and the entire 

 surface of the gastro-vascular cavity are covered with a deli- 

 cate, deciduous, violet-black membrane. In one specimen 

 the thick external coronal muscle forms a very broad, in the 

 other a comparatively narrow, band. 



The bathybial habitat of Atolla has been argued by Pro- 

 fessor Hseckel on the ground of the retrogression of some of 

 the organs of sense. It might be added that the violet- 

 black of the pigmented parts is such as in our experience is 

 only to-be found in undoubted bathybial forms, as in certain 

 deep-sea Zoantharia and Fishes. 



Class ANTHOZOA. 

 Subclass ALCYONIOMORPHA. 

 Order PENNATULIDA. 



In 240 to 220 fathoms, off the west coast of the Andamans, 

 some fine specimens of an Umbellula were taken ; and in 

 1000 fathoms, in the Laccadive Sea, several specimens of a 

 Funiculid were obtained with the polyparium coloured a 

 uniform delicate pink. 



Subclass ACTINI0M0EPHA. 



Order ACTINIARIA. 



Family Actinidae. 



Specimens of three gigantic species of bathybial Actiniaria 

 were met with during the season — one species in 1310 

 fathoms in the Bay of Bengal (Station 97), the others in the 

 Laccadive Sea in 1000 and 740 fathoms (Stations 104 and 

 105). 



An Epizoanthus symbiotic with Ilyalonema must also be 

 mentioned. 



Lastly, at 740 fathoms in the Laccadive Sea there was 

 obtained a colonial Zoantharian closely resembling Professor 

 S. I. Smith's figure (Proc. U. S. Nat. Mus. iii., 1883) of 

 Epizoanthus paguriphilus, Verrill, which, like Professor 

 Verrill's species, forms a " carcinoecium " for a hermit-crab 

 of the genus Parapagurus. In our specimen, however, no 

 adventitious particles have been incorporated either in the 

 ccenenchyma or in the tests of the polyps ; but the whule 



