41 fi Dr. Johnston's Cviitributioiis tu the British Fauna. 



Aitr. LII. Contributions to the British Fauna. By Guorgk 

 Johnston, M.D., Felloiv of the Royal College of Surgeons 

 of Edinburgh, S)-c. 



[Continued from p. 57.] 



CI. Gasteropoda ^ 



Ord. NuDiBRANCHiA \ Cuvier. 

 Gen. Doris ^ 



Doris tuberculata. 



Doris corpore ovato-oblongo, supra tuberciilis rotundis granulate, fusco- 

 marmorato ; tentaculis superioribus conicis, e foveis nudis exseren- 

 tibus. 



Doris tuberculata? Lamarck, Anini. sans Verteb., vi. i. 311. 



Hab. Mare Britannicum. Near Berwick. 



Desc. Body ovate-oblong, rather depressed, 3 inches long, nearly 

 2 broad. Cloak grey, marbled with cinereous and pink spots, and closely 

 covered with round prominent unequal tubercles of a blueish colour ; 

 the margin broad, entire, somewhat undulate. Space between the cloak 

 and foot white. Foot pale yellow. Superior Tentacula conical, round, 

 the upper half yellow and imbricate, the base white and smooth ; the 

 apertures with smooth even edges. BranchiceW, large, pinnate, the 

 branches beautifully pectinate, so that each resembles a fine plume of a 

 light blue colour, spotted with white about the base. They form a cir- 

 cle round the anus, which is streaked with lines of a sulphur colour. 



Obs. The figure of Doris .4rgo in Pennant, Brit. Zool. iv. tab. 24. 

 Edit. 1812, is a tolerably good representation of our animal, but from 

 that species it diflfers in colour, and in the character of its cloak, which 

 is very distinctly tuberculated to the naked eye, while in the D. Argo it 

 is said to be smooth. The Tentacula are represented as conical by Pen- 

 nant, but they are described as club-shaped and verrucose by Lamarck. 

 I suspect that the figure of the former naturalist has been taken from a 



