^22 Memoirs of the Indian Museum. [Voi,. V, 



Chilka Lake and in the collection there are also specimens from the lower reaches of 

 the river Adyar near Madras. The species is almost certainly identical with Pherusa 

 australis Haswell described from Botany Bay, New South Wales, and this helps to 

 connect the extreme points at which the species is found. 1 This case forms a parallel 

 to that of Melita inaequistylis, which is found in brackish waters in New Zealand and 

 in India and Ceylon, but the latter species has been recorded from a greater number 

 of marine localities. 



Discussion of the importance of the distribution of the species, as mentioned 

 above, must be held over for a later occasion, but it may be mentioned in connection 

 therewith that Xiphocaris(=Paratya) curvirostris (Heller), the freshwater shrimp com- 

 mon in New Zealand streams, also occurs in Assam and that Paracorophium excavatum 

 (G. M. Thomson), an Amphipod which occurs in brackish and fresh water on the 

 coast of New Zealand, has recently been found in similar localities in Brisbane river, 

 Queensland. a 



One of the most interesting Amphipods in the Chilka Lake fauna is Niphargus 

 chilkensis sp. nov. This form was found at various localities apparently under the 

 same conditions as the other species. It possesses eyes, though these seem to be 

 somewhat imperfect. It differs in several points from the species of Niphargus found 

 in Europe and Northern Africa. A closely related species has recently been sent to 

 me from the underground waters in the Philippine Islands. 



Under each species I have given only those synonyms and references that appear 

 to be of importance in connection with the present paper. 



The names of authors followed by a date refer to the bibliographical list on p. 556. 



I wish to express my grateful thanks to Dr. Annandale for the opportunity of 

 examining and reporting upon this fine collection and to Miss B. M. Herriott, M.A., 

 Assistant at the Biological Laboratory of Canterbury College, for preparing the figures 

 and assisting me in other ways. 



LIST OF SPECIES, WITH DISTRIBUTION. 



1. Ampelisca pusilla Sars. Chilka Lake; Buxar, R. Ganges ; Arctic Seas ; North 



Atlantic ; East coast of x^ustralia. 



2. A mphilochus brunneus Delia Valle. Chilka Lake; North Sea; Mediterranean. 



3. Idunella chilkensis sp. nov. Chilka Lake. 



4. Perioculodes longimanus (Bate & Westw.). Chilka Lake; Ceylon; Arctic 



Ocean ; North Sea ; North Atlantic ; Mediterranean. 



5. Synchelidium haplocheles (Grube). Chilka Lake; Ceylon; North Sea; North 



Atlantic ; Mediterranean. 



6. Paracalliope fluviatilis (G. M. Thomson). Chilka Lake; Philippine Islands ; 



New Zealand ; Australia ; (in fresh and brackish water). 



7. Niphargus chilkensis sp. nov. Chilka Lake. 



1 Since this was written the species has been found in the Philippine Islands. 



2 See also S. Kemp's remarks on the distribution of certain Onychophora and other terrestrial 

 animals {Rec. Ind. Mus., Vol. VII, p. 491). 



