of British Nudihranchiata. 103 



ness from D. tuberculata, with which it had been confounded by 

 Dr. Leach. 



Doris proxima. 



Orange-yellow : cloak with stout elliptical tubercles : dorsal 

 tentacles subclavate : head furnished with a broad veil : no oral 

 tentacles : branchial plumes 11, simply pinnate, non -retractile. 

 Length ^ an inch. 



This species has been sent us by Mr. Price of Birkenhead, 

 where it occurs not unfrequently within tide-marks, in the spring. 

 It bears great resemblance to Doris aspera, of which we at first 

 thought it might be a variety. A careful inspection, however, 

 shows some points of difference ; more especially in the shape of 

 the tubercles, which are elliptical and obtusely pointed in this 

 species, while in D. aspera they are rounded and flattish. An 

 examination of the tongue has set the matter at rest, as it is 

 decidedly different from that of D. aspera. 



Thecacera capitata. 



White, freckled with greenish brown : tentacles retractile 

 within cavities : veil with two to four orange tubercles on each 

 side, and a row of orange tubercles between the tentacles : bran- 

 chial plumes 7, pinnate, tipped with orange : a stout branchial 

 lobe on each side also tipped with orange. Length I inch. 



Dredged at St. Ives, Cornwall, by Mr. Barlee, to whom we 

 are indebted for specimens in spirits. 



Idalta elegans, Leuckart. 



Rose-coloured, freckled ; the processes orange-yellow : anterior 

 filaments 2 (one near the base of each tentacle) : lateral filaments 

 numerous, irregular, the posterior ones obtuse, lobular : dorsal 

 filaments 5^, three on the median line and two sublateral : bran- 

 chial plumes 18 (the anterior and posterior ones bifid) : foot mar- 

 gined with yellow. Length li inch. 



We obtained specimens of this beautiful Idalia by dredging off 

 Guernsey last summer. A species described in the Catalogue of 

 the Mollusca of Northumberland and Durham, which we referred 

 with doubt to /. elegans, we now propose to call /. Leachii. A 

 specimen of the latter is preserved in Dr. Leaches collection in 

 the British Museum. 



Idalia pulchella. 



Body freckled with pale lilac : tentacles subclavate : anterior 

 filaments 4, set on an expanded palHal ridge : lateral filaments 5 

 or 6 on each side, the last large and bifid : branchial plumes 1 1 



