Ceylon Nudibr and date Molluscs. 



121 



lines run round the whole length. The internal one broader, 

 taking within its circuit the dorsal tentacles and anal orifice ; 

 two other lines run parallel to this all round the mantle ; 

 the outer one narrowest. Dorsal tentacles large, conical, 

 pointed ; circularly laminated at the upper half, which is of a 

 black colour. The two oral tentacles small, black. Foot 

 whitish, notched in front ; the blackish viscera seen through. 

 Branching whitish on sides of the body except in front. Anal 

 opening on a black coloured tube, behind which, there are 

 4 or 5 large tubercles of the same form as those on the other 

 parts of mantle. Length one inch ; £ inch broad. 

 Very rare. 



Genus. Diphyllidia. Cuv. 



Syn. Linguella. Blain. 



Animal oblong ; mantle ample ; gills limited to the hinder 

 two-thirds of the body ; head with minute tentacles and a 

 lobe-like veil ; vent at the right side, behind the reproduc- 

 tive orifices ? lingual teeth 30. 1. 30. 



Diphyllidia Formosa. Kel. S 



Body pink. Mantle leaf-like ; dark purple, with purplish 

 black shades; edge yellow, streaked longitudinally with golden 

 yellow, (broad lines alternated with very delicate narrow ones.) 

 Veil purple black, except the anterior edge : beneath, of 

 a lively pink colour. Foot pink, grooved in the median line 

 of posterior half. Branchias buff ; a whitish spot on anterior 

 third of plumes. Dorsal tentacles emerging through notches on 

 anterior edge of mantle ; tentacles red with blackish tips 

 and sides. No oral tentacle. Length 2 J inches, \\ inch broad. 



1858.] 



B 



