Dr. E, F. Kelaart on new species of Ceylonese Mollusca. 493 



Fam. ElysiadsB. 

 Genus Elysia, Risso. 



Animal elliptical, depressed, with wing-like lateral expansions. 

 Tentacles simple, with sessile eyes behind them. Foot narrow. 



Elysia grandifolia, Kel. 



Head and body light green; white-, and occasionallyblack-spotted. 

 Head and neck naked. Tentacles two, folded longitudinally 

 on side of head ; bronzed green, tip brown. Buccal tentacles 

 two, small. Membranous wing-like expansion on each side 

 of body, broad anteriorly, acutely pointed posteriorly, and 

 united at the tail. Membrane green, edged with a black 

 and a golden-yellow line. No distinct foot. Orifice on the 

 back (?). Mouth beneath. 



The whole animal gives one the idea of a large leaf; and 

 when moving, that of a butterfly. Found on sea-weed. Some 

 are more than 3 inches long ; greatest transverse diameter, with 

 wings expanded, 2^ inches. Distinct veins, filled with fluid, 

 seen on the wnngs ; the heart pulsating on the centre of the 

 back. I have some doubts as to the propriety of placing this 

 interesting creature in the genus Elysia. If on further investi- 

 gation it is found that it does not belong to any known genus, 

 I propose naming it Hydropsyche^. 



Elysia punctata, Kel. 



Smaller than the last species, largest specimen seen measuring 

 1^ inch. Animal of a lighter green colour. Tentacles dark 

 brown, spotted with white. Back whitish green, dotted with 

 black and green. Edge of mantle black, and shaded with golden; 

 under surface of wings tubercular, and dotted with black. 



Found on sea- weed. Not easily distinguished from the young 

 of E. grandifolia. 



Elysia carulea, Kel. 



Tentacles two ; blue, with a central red ring, tip blackish. Body 

 and wings blue ; under part of head and fore part of foot 

 red ; edge of wing lined with black and red lines, the latter 

 outermost. 

 This is a very small beautiful species, about | inch long ; 



when the wings are folded, it is not thicker than a crow's quill. 



Found on sea-weed in the Inner Harbour. All three species 



have the same generic characters, and doubtless belong to the 



same genus. 

 * This name is already used for a genus of Trichopterous Insects.— W. S. D. 



