398 Dr. E. F. Kelaart on new species of Ceylonese Mollus<:u. 



Doris rubra, Kel. 

 Syn. Doris Solea ?, Cuv. 

 Body 1^ inch long, oblong, pellucid red. Mantle crimson-red, 

 and maculated with irregularly-shaped dark brick-red or 

 purple spots; those on the back larger. Tentacles large, 

 clavate ; apex red, laminated. Branchiae six, of a light rose- 

 colour, large, tripinnate ; the two anterior ones smaller than 

 the rest. Foot oblong, broad, of a pinkish-red colour, longer 

 - than mantle, rounded in front and transversely grooved ; an- 

 terior lamina notched in centre. Oral tentacles linear. With 

 mantle extended, nearly 3 inches. 



This beautiful red species is found in great abundance in and 

 out of the harbour of Trhicomalec, and is generally seen on 

 mossy rocks a few feet below the surface of the water. When 

 confined in a glass vivarium, it becomes, nearly throughout, of a 

 pellucid pinkish-white colour at night, which hue it retains till 

 dawn, when it gradually assumes its brilliant-red diurnal cos- 

 tume. Spawns in the months of May and June ; ova deposited 

 in three or four large, white, ribbon-like convolutions. 



Doris osseosa, Kel. 



Body 1 inch long. Mantle hard, cartilaginous, granular and 

 pitted ; granules of a whitish colour ; on the median line is a 

 narrow ridge extending from base of tentacles to branchial 

 plumes, which are four or five in number, emerging hori- 

 zontally from under the posterior termination of dorsal ridge; 

 in some specimens there is a large pitted protuberance on the 

 centre of the ridge. Dorsal tentacles with large granular 

 sheaths ; apex conical, lamellated, of a pale green colour. Oral 

 tentacles white. Foot small, narrow. Branchial plumes small, 

 bipinnated. 

 This curiously formed Do7ns resembles a piece of bone, or 



piece of worm-eaten white stone. Its habits are those of the 



other Dorida. 



Doris Constantia, Kel. 



Coriaceous. Body | inch long, light yellow. Mantle yellowish 

 brown, granular ; dark-brown spots on the edge. Dorsal ten- 

 tacles yellow, conical, swollen at the apex, laminated ; tip pro- 

 duced, white. Oral tentacles small, linear. Branchial plumes 

 whitish, five or six, small, bipinnate. Foot small, covered by 

 the mantle. Under parts yellowish. 

 I have only seen one example of this species, which lived for 



many months in a vivarium. It came nightly to one of the 



