GASTEROPODA. 305 
darker line, cream-coloured between. Cervical tentacles clavate, pale 
cinereous at base, annulate with orange at the middle, then with indigo- 
blue, then with cinereous, and tipped lilac; lamelle about fifteen ; la- 
bial tentacles minute; branchial star not as wide as the body, having 
six tapering plumules, with eight or nine leaflets on each side, and a 
terminal one, the three upper pairs indigo-blue, the others cream- 
coloured. Beneath pale; margin of the foot pale lilac, margin of the 
mantle yellowish. Foot narrow, transverse in front, tapering to a 
delicate point, which extends somewhat beyond the body. 
Length three-fourths of an inch; breadth an eighth of an inch; 
height one-twelfth of an in c 
“Found on shells of Perna, in the harbour of Talao, Eimeo.”’ 
Couthouy. 
By two bright-red lines along the back, and the indigo-barred ten- 
tacles and plumes, this species is easily identified. It is allied to “ D. 
rayée,” Souleyet (Voy. de la Bonite, pl. 25, f. 5-9), which has orange 
tentacles and branchie, and several lines along the back. It is still 
more like D. lemniscata, Quoy, a much larger species, with only 
slight differences in coloration. 
Figures 400, 400a, 4004, lateral, dorsal, and ventral views of the 
animal; 400c, tentacles enlarged, front and side views; 400d, bran- 
chial star, enlarged ; 400 e, plumule, still more enlarged. 
Ko.is ATTENUATUS, (Couthouy MS.) 
Corpus valdé attenuatum, incoloratum: caput rotundatum ; tentaculis 
labialibus subulatis: tentaculis cervicalibus compressis, ciliatis: pes 
antice rotundatus : papilla branchiales numerosa, flavicantes, utrinque 
longitudinalkter disposite. 
Body limaciform, much attenuated posteriorly, colourless except on 
the back, where there is a faint ruddy tinge; branchial papille short, 
obtuse, very numerous, disposed in a continuous range along each 
side, from the neck about two-thirds the length of the animal, yel- 
lowish, filled in the interior with a brownish substance ; head rounded ; 
77 
