No, 9,— 1856-8.] new ceylon nudibbanchiata, &c. 101 



bright red streak on the back of each ; slightly contractile, 

 but they do not retract into a cavity ; when extended, they 

 resemble a small tuft of marabout feathers. Genital orifice in a 

 nipple-] ike process, situated between the anterior and middle- 

 third of body. Foot long, and broad ; terminating posteriorly 

 in a lancet-shaped point, about J inch from body ; white, with 

 a delicate light orange-red line on the edge of the foot : this 

 line is carried partially on each side of head. Tentacles 2, 

 dorsal ; short, conical, pointed ; upper half indistinctly laminated ; 

 of a light orange-red colour at tip ; base colourless, transparent. 

 Ova yellow, deposited in bead-like coils. They generally deposit 

 the coils on branches of sea-weed. Sometimes this Doris 

 resembles a miniature fan-tail pigeon ; particularly when 

 perched on sea-weed, and the small marabout plumes are 

 elongated. 



Found on rocks and sea-weed near Sober Island. 



This elegant creature does not resemble any of the described 

 species. The form of the body is not unlike that of the genus 

 Ancula. Its nearest approach, in other particulars, is to 

 Polycera. 



I venture to make a distinct genus of this Doris, and dedicate 

 it to Sir Walter Trevelyan, to whom I am indebted so much 

 for the liberal aid he has afforded me in my researches into 

 the Natural History of Ceylon. 



Fam. Tritoniadje. 

 Melibcea. Rang. 



Animal elongated, with a narrow, channelled foot, and long 

 slender tail ; sides of the back with pairs of tuberculated lobes, 

 easily deciduous ; tentacles cylindrical, retractile into long 

 trumpet-shaped sheaths ; head covered by a lobe-like veil ; 

 sexual orifices behind right tentacle ; excretory behind first 

 gill on the right side.— ( Woodivar d.) 



