ioo 



JOURNAL E. A, S. (OEYLON.) [Vol. III. 



Sub-genus. Onchidoris. 



Onchidoris Leachii, Blainv. 



Carneous. Body oval, about 1 j inch long. Mantle granular 

 and studded with filamentous granules. Those on the posterior 

 third of mantle often large, and appearing like small branchial 

 plumes. No dorsal tentacles. Two oral tentacles, which appear 

 to protrude through notches, from under the anterior edge of 

 mantle. The foot is broad and nearly occupies the whole of 

 the under part of mantle. Anus opens on the under surface of 

 the posterior part of mantle. Orifice of the organs of generation 

 on the right side. 



Found on rocks in the Inner Harbour. I have scarcely any 

 doubt, that this is the Onchidore described by Blainville from 

 a specimen seen in the British Museum, whose habitat was not 

 known. 



The colour of the animal is of a light-grey, mottled with 

 black spots in some specimens. In spirits the filamentous granules 

 are not seen, but when the animal is alive they are so distinctly, 

 and the contractile character of the filaments are very observable, 

 especially of the larger ones. 



Trevelyana, n. g. 



Body without a cloak. Two dorsal tentacles without sheaths, 

 non-retractile. Mouth in front of head, without tentacles. 

 Branchiae in a circular disc on the back ; non-retractile. 



Trevelyana Zeylanica. Kel. 



Body If inch long, narrow, elevated and inflated near the 

 branchial plumes ; semi-gelatinous, white and spotted with 

 small dark orange-red spots, set wide apart from each other. 

 Head rather produced and rounded ; also spotted red. Mouth 

 circular, small ; situated in front, without veil or tentacles. 

 Branchial plumes 15 or 16, situated on posterior third of body, 

 round a large disc, in the centre of which is the vent. Flumes 

 long, downy, closely set ; pure white, with a longitudinal 



