Dr. E. F. Kelaart on new species of Ceylonese Mollusca. 269 



very pretty species on an old oyster shell on the Pearl Banks of 

 Aripo, during the fishery of 1859, when I had the pleasure of 

 meeting him there. I have named it in honour of the discoverer, 

 with whom I have spent many happy hours at Aripo. 



M. Humbert also found a small white Doris, with a black- or 

 deep-blue-margined mantle. The creature was scarcely Jth of 

 an inch in length, and looked like the young of Doris Mac- 

 carthiana, from its narrow mantle and exposed body. There is 

 also a white species of Doris with a black edge to the mantle, 

 described by Riippel. 



The following are other Nudibranchiate mollusks found in or 

 near the Pearl Banks of Aripo, in the months of February, 

 March, and April, 1858 :— 



Dm-is funebris, D. marmorata, D. ffrisea, D. atrata, D. rubra, 

 Trevelyana, zeylanica, Pleurobranchus citrinus, Riippel. 



I have also found a species of Diphyllidia, which is provision- 

 ally named 



Diphyllidia marmorata, Kel. 



Body IJ inch long, spotted with white. Mantle above yellowish 

 brown, and marbled with darker brown or greenish brown. 

 Tentacles slightly laminated. Veil white, with a yellow mar- 

 gin. Under parts of mantle greenish brown. Branchiae in- 

 distinct, in longitudinal striae under the mantle. Foot white, 

 longitudinally grooved in centre of posterior third. 



Genus Bornella, Gray. 



Animal elongated. Dorsal tentacles retractile into branched 

 sheaths. Head with stellate processes. Back with two rows 

 of cylindrical, branched, gastric processes, to which small 

 dendritic gills are attached. Foot very narrow. 



Bornella Hancockana, Kel. 



Body If inch long, narrow, tapering, rounded on the back, and 

 slightly flattened on the sides. Anterior half of an opake 

 white, and posterior half of a light brown colour, reticulated 

 with red throughout. Blackish viscera visible in some parts 

 of the body and branchiae. Tentacular sheaths longer than 

 branchiae, and divided at their extremities into three or four 

 tentacular or digitate processes similar to those of the bran- 

 chiae. Sheath coloured and reticulated as the body. Ten- 

 tacles small, clavate, pointed, and slightly plumose, circularly 

 laminated, of a pale yellowish colour. Head indistinct ; on 

 each side a small cluster of short, unequal, tentacular pro- 

 longations of a white colour, a few with a red ring near the 



