-—" " - # 
— 
33 
nent granules. Dorsal tentacles small, erect, not pedunculated, ovate, 
coarsely and obliquely lamellated, and retractile into simple cavities. 
Branchial plumes eleven, large, rudely pinnate, increasing in height 
posteriorly, procumbent, and retractile into a simple semicircular 
cavity. Muzzle prominent. Foot oblong, rounded at both ends. 
Colour pale yellow, with green papille. 
At first sight the above species might be confounded with the 
small rigid granular species of Doris; but the arrangement of the 
branchiz and the non-pedunculated dorsal tentacles constitute dif- 
ferences sufficient to separate it. 
42. HexABRANCHUS PULCHELLUS. 
Form oblongo-ovate, smooth, and subpellucid. Mantle depressed, 
convex above, similarly rounded at both ends; margins thin and 
undulated. Branchial plumes seven, small, ramose, erect, surround- 
ing the vent, and each retractile into a simple cavity. Dorsal ten- 
tacles remote from each other, ovate, finely and obliquely lamellated, 
and retractile into simple cavities. Oral tentacles large, compressed, 
and strongly dilated outwards. Foot elongate-oval, and projecting 
posteriorly beyond the mantle. Colour pale, with a light yellow 
tinge along the dorsal region, where there are also numerous carmine 
dots; similar coloured dots around the margin of the mantle, which 
is edged with white. Branchiz pale and edged with carmine. Ten- 
tacles pale and tipped with carmine. 
43. HexaBRANCHUS NEBULOSUS. 
Body oblongo-ovate, smooth, during locomotion much elongated. 
Mantle rounded above, widest in the middle, rounded at both ends ; 
edges thin, crenate and undulated. Branchial plumes eight, inserted 
far back, large, curved and elevated, tripinnate, and retractile in 
cavities around the vent. Dorsal tentacles large, ovate, stoutly pe- 
dunculate, pinnatifid, lamellate, and retractile into simple cavities. 
Orals small, scarcely visible. Foot elongate, projecting beyond the 
mantle posteriorly during locomotion, emarginated in front; lateral 
edges thin. Mouth close to the foot. Colour, above black, mar- 
gined with bluish slate, with numerous irregular-sized round whitish 
dots, which are the most numerous around the margins. Branchial 
plumes pale dusky. Dorsal tentacles darker, tips white. 
Length 1? inch. 
44, TRiTONIA HAWAIIENSIS. 
Form elongate-oblong, widest anterior to the middle, smooth, de- 
pressed above, and tapering to a point behind. Branchial plumes 
arborescent, irregular in size, opposite and disposed in two rows, of 
eleven each, and extending to the posterior end of the body. Ten- 
tacles cylindrically tapering, and retractile into stout, tubular laci- 
niated sheaths. Veil strongly digitated. Foot linear, grooved, and 
pointed at both ends. Colour pale, freckled with pale purplish- 
brown ; a longitudinal light band extends from the head to the 
No. 419.—ProcrEpDINGs oF THE ZOOLOGICAL SocirTY. 
