490 Dr. E. F. Kelaart on new species of Ceylonese Mollusca. 



tentacles retractile within a sheath, clavate, laminated, incurved 

 at the tip ; brown, white-tipped. Oral tentacles white, broad 

 and short. Branchial plumes five, short, bipinnated, retrac- 

 tile, 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 trans- 

 parent foot. Ova bright red, in narrow coils. The whole 

 animal is scarcely 1 inch long, and its broadest part not 

 more than |ths 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 this pretty little creature. The transparent membra- 

 nous expansion is fully extended when the animal swims, which 

 it does more freely than any known species. For ten or fifteen 

 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. Eolidse. 



Animal with papillose gills arranged along the sides of the back. 

 Tentacles sheathless, non-retractile. Lingual teeth O'l'O. Ra- 

 mifications of the stomach and liver extending into the dorsal 

 papillge. Excretory orifices on the right side. Skin smooth, 

 without spicula. No distinct mantle. 



Eolis * Husseyi, Kel. 



Tentacles four; both pairs of the same form, but the ante- 

 rior ones longer, of a limpid orange hue tipped with white. 

 Back of a dull orange-brown colour; a triangular white space 

 behind the dorsal tentacle. Branchiae numerous, in three 

 rows on each side of body, white and ringed with light purple ; 

 tip white. Foot dilated anteriorly ; no lateral processes. 

 Rare. Named in memory of a departed and beloved com- 

 panion of my earliest scientific labours. 



Eolis bicolor, Kel. 



Body f inch long, slender, waxy white ; a dusky spot on neck 

 anterior to dorsal tentacles. Dorsal tentacles short, smooth, 

 transparent white at base, corrugated or laminated at apex, 

 of a deep orange-red colour, becoming darker at the tip. 

 Oral tentacles twice as long, pellucid white throughout, 

 tapering, curved. Head small, rounded. Branchise medium- 

 sized, narrow, acutely pointed, white with a subterminal 

 orange-red ring, apex waxy white ; they are set in six or 

 * Etvm. iEolis, (lautifhtcr of iEolus. 



