124 Dr. Johnston on Scottish Mollusca. 



1. T. claviger, body ovate, the back ornamented with scarlet 

 tubercles, the sides with a series of short cylindrical papillae 

 tipt with orange. 



Doris clavigera, Mull. Zool. Dan. Prod. 229. Zool. Dan. tab. \7.fig. 



1 — 3. Turt. Gmel.iv. 77. — Tritonia clavigera, Bosc. Vers. I104.pl. 3. 



Jig. 2. pessima. — Tergipes pulcher, Johnston in Mag. Nat. Hist. vii. 



490. jig. 59. 

 Hah. Berwick Bay, in deep water, rare. 



Desc. Body half an inch long, ovate, soft, white ornamented 

 with scarlet tubercles scattered over the back, and with short 

 cylindrical processes tipt with bright orange arranged round 

 the sides. Mouth subinferior, terminal, with a linear-oblong 

 membranous tongue set with minute prickles in close trans- 

 verse series. Tentacula two, dorsal, non-retractile, short, oval, 

 imbricate, orange-coloured. Back plane, studded with many 

 scarlet unequal tubercles, some of which, when magnified, ap- 

 pear ocellated. Towards the tail are three short white pro- 

 cesses placed in a line across the back, which are also not re- 

 tractile ; and there are eighteen short obtuse branchial pro- 

 cesses placed on the margins, the smallest in front, and all 

 tipped with orange. Foot oblong with plain margins. Aper- 

 ture of generation lateral and anterior. 



When viewed through a magnifier this pretty mollusk has 

 a roughish or flocculent appearance. Its motions are slow. 

 The cloak contains numerous calcareous spicula interlaced in 

 every direction, the spicula of unequal sizes, curved, with a 

 sort of knob in the centre, whence it tapers to either end, the 

 points of some of them being forked. The latter sort are 

 abundant in the branchial processes, and the forked end is 

 always pointed outwards. 



Cuvier referred this remarkable species with doubt and he- 

 sitation to Tritonia ; and with repugnance I placed it first with 

 Tergipes ; but the emaxillary mouth, the structure of the skin, 

 full of spicula, and thefacies, point out its true relations to be 

 with Doris, It is unquestionably the type of a new genus, 

 which I have attempted to characterise rather loosely, that it 

 may embrace the following equally anomalous molluscum. 



2. T. nothus, body limaciform, variegated with black, yel- 



