370 SIR C. ELIOT OX NUDIBRAXCHS [DeC. 1, 



The living animal was spongy and almost gelatinous in texture. 

 The alcoholic specimens though flabby have become considerably 

 shrunk and hardened. The larger one (to which all the measure- 

 ments given below refer) is 5' 7 centimetres in length, 3"8 in breadth, 

 and 2*3 in height. Down the centre of the back runs a some- 

 what indistinct ridge, on each side of which is a row of five pits, 

 with black bottoms. There is one similar pit behind the bianchial 

 pocket. In the smaller specimen the distribution of the pits 

 is different, and it wotild appear that no particular arrangement 

 can be regarded as characteristic of the species. In this specimen 

 also the dorsal ridge and a knotty crest between the rhinophores 

 are much more distinct than in the larger one, bearing out Alder 

 and Hancock's remark that these features are most conspicuous 

 in the young individuals. In both specimens the back is covered 

 with irregular tuberculate warts or prominences. The rhino- 

 phores project out of tubes which are about 5 millimetres high 

 and thickly studded with tubercles, about five being set round 

 the edge. The branchial pocket projects about 6 millimetres and 

 opens backwards. In the lai^ger specimen it is distinctly bilabiate. 

 The upper lip is thickly tuberculate in its whole extent and bears 

 three compound tubercles on its edge which close like a valve ; 

 the lower lip has no tubercles on the edge and is altogether 

 smoother than the other. In the smaller specimen the pocket 

 opens backwards, but is round and not two-lipped. It is probable 

 that the tubercles increase in number and size as the animal 

 grow^s older. The branchiae are large and strong, tripinnate, and 

 apparently five in number, but so deeply bifid that it would 

 hardly be wrong to call them ten. In both specimens the foot is 

 deeply grooved and notched in front and the upper lamina united 

 to the head below the mouth, an arrangement which differs from 

 that seen in S'phcerodoris {Icevis), where the mouth seems to be 

 between the two laminae. 



The labial cuticle is very strong and much puckered, but no 

 armature was discernible. Round the buccal mass, at the 

 posterior end of the oral tube, are set a number of glands, of 

 which I found ten in one specimen and eight in the other. They 

 are mostly three-fingered in shape. The radula consists of only 

 23 rows, each containing about 40 teeth on either side of the 

 naked rhachis, but looks large and broad on account of the 

 unusual size of the teeth, which are simply hamate with yellowish 

 bases and colourless hooks. The innermost teeth are very small, 

 but gradually increase in size up to the 15th, after which they are 

 equal. The two or three outermost are reduced. The stomach is 

 small but free. No armature was discernible in the reproductive 

 organs. 



I think these specimens are clearly the Boris areolata of 

 A. & H., and equally clearly referable to the genus Trippa, Bgh. 

 Probably Doris spongiosa Kelaart (Ann. Mag. Nat. Hist. (3) 

 111. 1859, p. 303) is the same species. Trippa {Phlegmodoris) 

 mephitica Bgh. is a closely allied form, and I should not be 

 surprised if it even turned out to be a variety of, or identical with, 



