MOLLUSCA NÜDIBRANCHIATA. 



By Sir Charles Eliot. 



The Nudibranchs collected by Dr. Annandale and Mr. Kemp in the Chilka Lake 

 consist of three specimens, namely two small Aeolids and an Elysia. Both species 

 must be treated as new. They may possibly be identical with animals known to us 

 only by the figures and slight descriptions of older naturalists, but they do not 

 correspond exactly with any such figures and descriptions. 



Cuthona annandalei, a member of the same genus of Aeolids, has been found 

 in brackish water in the mouths of the Ganges and Alder ia modesta, a form allied 

 to Elysia though not very nearly, is known to inhabit brackish marshes in the 

 British Isles. 



Cuthona henrici, sp. nov. 



The notes on the living animal are as follows : — 



" Two specimens (with drawing from life of one l ) from off Ganta Sua in the main 



area of the Chilka Lake, 28-XÜ-1913. 

 Colour yellowish-white ; cerata dark olive-green with 



variable black markings at their base. 

 The specimens were dredged in about five feet of 

 water from among weeds on a muddy bottom 

 just off the rocks of Ganta Sua. When placed in 

 a dish they floated in the surface-film back down- 

 wards and moved along rapidly in this position. 

 They probably feed on the Hydroid Bimeria flumi- 



nalis, Annandale. 

 Specific gravity of water (corrected) about i"Oo6." 

 The preserved specimens correspond to the above 

 description, but the bodies appear to have shrunk more 

 than the cerata, making the latter seem relatively 

 larger. The colour has become a dull yellowish-brown. 

 The large specimen is bent, but would be about 10 mm. 

 long if straightened. 



The oral tentacles are large and distinct. The rhino- 

 phores are of about the same size, cylindrical and smooth, 



Fig. 1. 



Cuthona henrici, sp. n. 

 X15. 

 Drawn from life by Mr. G. H. Henry. 



The drawing was made by Mr. Henry of the Colombo Museum who is alluded to in the specific 



name. 



