No. 9.— 1856-8.] new oeylon nupibranchiata, &o. 103 



I have found only one specimen on a branch of sea-weed. It 

 looked at first like a piece of green weed, but on placing it in 

 fresh sea water, the lobes expanded and waved about very briskly. 

 The red tips of the lobes contrasted beautifully with the bright 

 green of the animal. It lived only a few hours. 



Polyceka (?) Zeylanica. Kel, 



Body J inch long. No distinct mantle. Head covered by a 

 membranous fimbriated veil ; the long filaments slightly toothed. 

 Veil continuous with a narrow membranous expansion on side 

 of body, which are united at the tail. Large fimbriated filaments 

 also on sides of body. A membranous crest runs on the medial 

 line of back. Dorsal tentacles retractile in a sheath ; clavate, 

 laminated, incurved at the tip ; brown, white tipped. Oral 

 tentacles white ; broad and short. Branchial plumes 5, short, 

 bi-pinnated, retractile, placed in a circle, in the centre of the 

 back, near the third pair of dorsal filaments. Colour above, 

 bright orange-red ; beneath whitish, with red specks seen 

 through the transparent foot. Ova, bright red ; in narrow 

 coils. The whole animal is scarcely 1 inch long ; and its 

 broadest part not more than f of an inch. 



I have placed this species, very doubtfully, under the head of 

 Polycera. I believe there is sufficient reason to make a new 

 genus of the leading characters of this pretty little creature. 

 The transparent membranous expansion is fully extended when 

 the animal swims, which it does, more freely than any known 

 species. For 10 or 15 minutes it will keep floating and moving 

 its body like an eel in the water. Very rare ; a few specimens 

 lived for many months in my vivarium. 



Fam. Molium. 



Animal with papillose gills, arranged along the sides of the 

 back ; tentacles sheathless, non-retractile ; lingual teeth 0. 1.0 ; 

 ramifications of the stomach and liver extending into the dorsal 

 papillae ; excretory orifices on the right side ; skin smooth, 

 without spicula : no distinct mantle. 



