132 MESSRS. ALDER AND HANCOCK ON 
Gonioporis mopgsta, n. sp. (Pl, XXVIII. fig. 12.) 
Body oblong, with parallel sides, and tapering to a very slender tail ; of a chestnut- 
brown colour. Cloak with a pale margin spotted with black and yellow, irregularly 
sinuated and turned up all round, forming two lobes before the dorsal tentacles, and 
expanded a good deal at the sides anteriorly, meeting in a point behind the branchiz, 
and thence forming a slight crest to the tail. Dorsal tentacles fusiform, largely lami- 
nated, and very slender below, brown like the body. Head very little extended beyond 
the cloak, produced into two clavate oral tentacles at the sides. Branchial plumes five, 
large, set rather widely apart round the anus; bi- or tri-pinnate, brown, the edges 
rather pale. Foot linear, tapering behind into a long slender tail. Length 17 inch. 
No specimen of this very distinct species was in the collection. 
Genus Trevetyana, Kelaart’. 
Body limaciform, without cloak or appendages. Dorsal tentacles laminated, retrac- 
tile: no oral tentacles. Branchiz plumose, surrounding the vent on the centre of the 
back, non-retractile. ‘Tongue broad, with simple spines: no collar nor jaws. 
Trevelyana, Kel. Journ. Asiatic Soc., and Ann. Nat. Hist. 3rd ser. vol. i. p. 257. 
TREVELYANA BIcoLoR, n. sp. (Pl. XXIX. figs. 11, 12.) 
Body elliptic-oblong, nearly linear, tapering to a blunt point behind, white on the 
head and sides, with an oval dorsal area of a blackish colour, the whole spotted with 
golden yellow. Tentacles clavate and laminated, white, with the apex and anterior 
portion yellow ; retractile within cavities. Branchial plumes twelve or thirteen, pin- 
nate, forming a circle on the centre of the back ; white, with a yellow midrib externally, 
and yellow tips. Foot linear, white. Length } an inch. 
No specimen of this interesting genus is preserved in the collection. 
Genus PLocamorpnorus, Riippell. 
Body limaciform. Cloak obsolete, forming an expanded veil with branched appen- 
dages on the head, and two or three tubercular processes on the sides of the back. 
Dorsal tentacles laminated, retractile. Oral tentacles flat. Branchiz plumose, non- 
retractile, surrounding the vent on the centre of the back; a wide fin-like carinated 
ridge running down the posterior part of the back to the tail. 
Tongue broad, with twelve or thirteen plates on each side, the three next the centre 
bicuspid : no central plate. An incomplete buccal collar. 
‘ This genus may possibly be synonymous with the Gymnodoris of Stimpson, Proceed. Philad. Acad. Nat. - 
Se. 1855. j 
