ELIOT : MUnfriRANCHS FROM THE INnO-1'AClFlC. 255 



The texture is stiff and spiculous, and the shape very flat. The 

 largest individual is 23 mm. long and 10 mm. broad. The margin 

 of the mantle is wide and undulated, and the margin of the foot almost 

 equally so, there being thus a deep groove all round the animal be- 

 tween the two laminae. The back bears a number of small and rather 

 distant tubercles ; they are irregular in shape, and bear secondary 

 excrescences ; the largest are about o'8 mm. high, but they become 

 smaller towards the mantle edge ; they are connected by a network 

 of slightly-raised spiculous lines, which is distinctly visible from the 

 underside of the mantle edge and from the inside of the dorsal integu- 

 ments. The rhinophore pockets are raised and smooth. The gill 

 pocket is the same, not indented and turned outwards. The gills are 

 consistently five in number, but vary somewhat in position ; in three 

 specimens at least the arrangement is clearly that described by 

 Alder & Hancock, the anus lying close to the root of the left anterior 

 plume. The anterior margin of the foot is indistinctly grooved, and 

 there are two flattish tentacles. The intestines are yellow and of the 

 usual type. From the buccal cone issues a long, thin, yellow tube, 

 bent in the usual way and of almost uniform breadth until it expands 

 into a globular dilatation, just before entering the liver. The verge 

 is armed with numerous colourless spines, some simply hamate, and 

 some recurved with the tip bent backwards. The numerous spicules 

 are colourless, transparent, and of very various shapes ; some are 

 simple, generally tapering towards the ends, and either straight or 

 bent ; others have an accessory branch, and are either shaped like a 

 fork or the letter Y, or else are straight with a single short projection 

 on the side, about the middle of their length. None, however, appear 

 to be cruciform, or to have more than a single branch ; they are 

 arranged in a reticulate pattern, which stands out very strongly on the 

 underside of the mantle. 



1 think this animal is Alder & Hancock's D. uiiniata^ of which 

 they say that it is vermilion coloured, but that there is a variety 

 (probably represented by the present specimens) much paler with 

 the centre of the back nearly black. They do not, however, mention 

 the expanded margins of the foot, which is one of the most prominent 

 characters of the form here described. 



The stiff consistency of this form might lead one to assign it to 

 Doriopstlla, but the buccal ganglia have long connectives and are 

 situated posteriorly. 



Doridopsis rubra (Kelaart). 



Bergh, " Danish Exped. to Siam ; Opisthobranchia," p. 190-1. 

 Ehot, "Nudibranchs from E. Africa and Zanzibar, VI.," Ffoc. Zool 

 Soc.j 1904, vol. 2, p. 279. 



