286 SIR C. ELIOT ON NUDIBRAXCHS [KoV. 29, 



floating between Zanzibar and Prison Island, On the shell were 

 also Clytia and a small species of barnacle. The notes on the 

 living animal are as follows : — '• Foot colourless and transparent. 

 Upper surface of body has a yellowish-brown tinge, which is 

 deeper on the tips of the cerata. The liver-canals appear as dark 

 <'reenish brown. The foot projects behind the cerata for some 

 distance. Cerata numerous ; they bear on the inside a wrinkled 

 branchial membrane." 



The preserved specimen is much bent, mid would perhaps 

 measure 20 mm. if straightened oiit. It is about 5 mm. broad. 

 The general shape is much that of Fiona nohilis { = marina), as 

 figured by Alder and Hancock, and the foot does not project 

 much behind, as it did in the living animal. The bare space 

 in the centre of the back is not large. On each side is a thick- 

 set longitudinal row of about 60 or 70 cerata. The transverse 

 arrangement is ii'regular, but in a given line there are generally 

 two or three large cerata, and one or two quite small ones out- 

 side. The cerata are somewhat thicker and more inflated than 

 those in specimens of Fiona nohilis received by me from Naples. 

 The larger ones bear on the inside a wrinkled branchial membrane, 

 but this is absent on the smaller ones. The pericardial promi- 

 nence is not conspicuous. The oral tentacles are some distance 

 above the mouth, and the rhinophores point sideways. No eyes 

 are visible. The anal papilla is latere- dorsal, just inside the cerata 

 about halfway down the right side. 



The radula consists of 33 horseshoe- shaped teeth, with a large 

 central cusp and six denticles on each side of it. At the base of 

 these main denticles, or between them, are occasional accessory 

 denticles. The jaws are yellowish, with a single row of rather 

 coarse teeth. 



I doubtfully identify this form with F. 2nnnata, recorded from 

 the Northern and Central Pacific. In favour of the identification 

 are the facts that the living animal had a projecting tail of some 

 lenoth, though this character is not cleai- in the preserved speci- 

 men, that only the larger cerata have the branchial membrane, 

 and that the teeth have six denticles on each side of the central 

 cusp. 



Hervia lixeata, sp. n. (Plate XVI. figs. 2 & 3.) 

 Two specimens from Prison Island, Zanzibar. The following 

 are the notes on the living animal : — " General body-colour a 

 translucent white with a slightly i-ed-brown tinge, which is well 

 marked on the rhinophores, and rather less so on the anterior 

 tentacles and on the sides of the narrow groove-like foot. The 

 body is marked with thin clear lines of opaque white. Cerata in 

 four or five clumps ; they are of a chocolate colour, with longi- 

 tudinal, fine, clear, opaque white lines. Between the rhinophores 

 . and tentacles are two biilliant vermilion blotches. The foot is 

 narrow and tapering to a tail." 



The preserved specimens are of a uniform diity yellow, and 



