52 Dr. Johnston on Scottish Mollusca. 



mately interlaced that no dissection could unravel the portions 

 that belonged to each*. 



Cuvier^s description and figure of his Doris tuber culata ap- 

 ply with such sufficient exactness to our Scottish species as to 

 render their identity scarcely doubtful. I have been informed 

 by Mr. J. E. Gray, to whom a specimen was sent, that it is 

 the same as the English ones from the coast of Devonshire, 

 usually confounded with the D. Argus, but which are, or were, 

 labelled in the British Museum as D. Britannica or D. Mon- 

 tagui. The D. tuberculata of Rapp in Nov. Act. Acad. Nat. 

 Cur. torn. xiii. p. 521. tab. 27. fig. 4. 5. appears to me distinct 

 from Cuvier's, in having the cloak sprinkled with granules 

 merely and not tuberculated, and in the greater proportional 

 breadth of the margin. It seems to be nearly allied to the fol- 

 lowing species. 



2. D. obvelata, body ovate-depressed, the cloak even and 

 finely granulated with a rather broad margin ; tentacular 

 sheaths level with the surface; branchial leaflets bipinnate, 

 about 15, forming a cup when expanded. Plate II. fig. 4 — J, 



Doris obvelata, Mull. Zool. Dan. Prod. 229. Turt. Gmel. iv. 79- Lam. 

 Anim. s. Vert. vi. i. 311. 



Hab. On rocks under sea-weeds near low- water mark. Berwick Bay, 

 where it was discovered by Mr. J. Alder of Newcastle. 



Desc. Body nearly one inch long, one third as broad, ellip- 

 tical, depressed, equally rounded at both ends, of a uniform 

 yellowish- white colour, usually dashed with a few dusky spots. 

 Cloak even, smooth and punctate to the naked eye, but really 

 finely granulated, as it appears through a common magnifier, 

 the border rather broad, undulated and plain. Space between 

 the cloak and foot smooth. Dorsal tentacula short, ovate, 

 bulged, obscurely lamellated, issuing from apertures without 

 any sheaths. Branchiae surrounding the nipple-like vent in 

 an entire circle, forming by their union a beautiful cupped blos- 

 som : there are fifteen leaflets of equal size, bipinnate, not 



* " En voila le premier exemple dans la nature, et la chose etait assez 

 singuliere pour me faire douter long-temps, et pour me faire mettre dans 

 cet examen toutes les precautions possibles. II n'y a qu'une seule sup- 

 position a faire qui soit contraire a mon idee ; c'est que les lobules de deux 

 glandes differentes seroient tellement entrelaces, qu'on ne pourroit les di- 

 stinguer a la vue ; une partie de ces lobules seroit hepatique, et produiroit 

 la bile ; l'autre donneroit la liqueur que le canal en question transmet au 

 dehors."— Cuv. Mem. sur le genre Doris, p. 16. 



