Mr. Forbes on new British Mollusca. 105 



family characters along with upper-tentacula, the structure 

 of which is laminated throughout the tribe. 



GoNioDORis EMARGiNATA. Nov. Sp, Forbes. 

 G. ovata, pallio postice emarginato dorso Icevi, sustentaculis 

 ovatis, acutis. Lon. 21 lin. (Plate II. fig. 12.) 



The body of this species is quadrangularly ovate, the man- 

 tle broad, turned up and waved at the margin : posteriorly it 

 is deeply notched. The back is smooth. The branchiae are 

 six in number ; the upper tentacula are rather long, the lower 

 ovate, acute, and largely developed. The back is of a fawn 

 colour, the branchiae and foot white, the border of the mantle 

 yellow, and there is a yellow stripe on the tail. It was 

 dredged in twenty fathoms water off the coast of Ballaugh, 

 Isle of Man, in October, 1839. 



On the same coast also occurs at low water, in considerable 

 abundance, the Doris nodosa of Montagu, another species of 

 this genus. As it seems to have escaped British naturalists 

 for many years, I add a description from my Manx speci- 

 mens. In form it is quadrangularly oblong : the mantle is 

 broad, turned up and waved at the margin, the back smooth, 

 with a central carina and four equidistant papillae on each 

 side. The lower or oral tentacula are lanceolate, acute and 

 large; the upper or dorsal laminated. The branchiae are 

 from 7 to 9 in number, plumose, narrow, arranged in a circle 

 (sometimes interrupted), forming an erect cup. The scallops 

 or wavings of the cloak are generally eight on each side, and 

 the papillae appear to be mucronate. The colour of the back 

 is white tinged with rose : the foot, tentacula, and branchiae 

 are white, and there is a yellow stripe on the tail. This 

 stripe is seen in several species of this genus. The Gonio- 

 doris nodosa is nearly three-fourths of an inch in length. 



The Doris Barvicensis of Dr. Johnston (Annals Nat. Hist. 

 V. i. p. 55., PL II. fig. 11-13) is a Goniodoris. In addition 

 to the locality originally given, it was found by Mr. Goodsir 

 and myself during the past summer under stones at low 

 water in Bressay Sound, Shetland. The Doris pallens and 

 Doris gracilis of Rapp (Nov. Acta Acad. Nat. Curios., torn, 

 xiii. 2nd part), also belong to this genus. The sources of 



Ann. Nat. Hist, Vol.5. No. 29. 4/?ri/ 1840. i 



