120 MESSRS. ALDER AND HANCOCK ON 
quently bearing one or two delicate filaments. Along the centre of the back there are 
three or four tubercular processes with filaments on the tubercles; there are a few 
similar processes on the sides; and smaller ones are scattered over the surface; the 
ground-colour of the cloak is ochre-yellow, inclining to orange towards the back, the 
centre of which is dark chocolate-brown, and large blotches of the same colour sur- 
round the margin, with a few various-sized spots between: under side freckled with 
brown, the marginal blotches also appearing through. Dorsal tentacles conical, bending 
backwards, finely laminated, with a shallow depressed line dividing the laminz in 
front. Oral tentacles linear. Branchial plumes six, tripinnate, brown, forming an 
incomplete circle. Foot moderate-sized, laminated in front, but not notched; pale; 
with a few scattered freckles, most numerous at the margin. Length from 1} to 2 inches. 
Tongue as in D. tuberculata ; no collar. 
A variety of this species is much more soberly coloured, being of a stone-colour, 
with obscure bluish-black markings. 
Rare. Two specimens are in the collection. 
The tubercles are not represented sufficiently distinct in the figure, nor is their 
character well given. 
Doris RusticaTA, n. sp. (Pl. XXX. figs. 4, 5.) 
Body oblong oval, moderately depressed. Cloak firm, covered with large, flat- 
topped, distant, spiculose tubercles, interspersed with a few smaller ones ; of a yellowish 
or rusty-brown colour. Dorsal tentacles clavate, with numerous chestnut-brown laminz 
nearly meeting in front ; when withdrawn, two large tubercles close over the orifice like 
lateral valves. No oral tentacles (?). The head with lateral angles. Branchial plumes 
five, pretty regularly bipinnate, freckled with brown. Foot pale and broad, slightly 
notched in front. Length nearly an inch. 
Tongue as in D, tuberculata ; no collar. 
This species is tolerably common. 
Doris castanga, Kelaart. (Pl. XXVIII. fig. 9.) 
Body ovate, not much elevated. Cloak large, of a dark chestnut-brown colour, 
covered with stout, blunt tubercles. Dorsal tentacles stout, brown, with white tips. 
Oral tentacles short, linear, pointed. Branchial plumes six (?), short, bipinnate, of a 
dark purplish-brown colour. Under parts deep vermilion-red, speckled with dark red. 
Foot short, red. Length nearly 2 inches. 
Doris castanea, Kel. in Journ. Asiatic Soc. (Ceylon Branch) 1858 ; idem in Ann. Nat. 
Hist. 3rd ser. vol. i. p. 303. 
Of this Doris, which we refer to the D. castanea of Kelaart, no specimen is preserved 
in the collection; we can therefore only judge from the single drawing, some parts of 
