1915.] Fauna of the Chilka Lake : Mysidacea. 161 



sewage in the water in which it lives. However this may be, it is a brackish water 

 form and must live in water which is liable to great changes in salinity at different 

 times and seasons of the year. 



Potamomysis assimilis, which has not as yet been found on the west coast of 

 India, is, as a rule, less abundant than Macropsis orientalis with which it usually 

 occurs ; but in pools at Chittagong it was actually the commoner of the two. In the 

 Chilka Lake it is as widely distributed as the preceding species and has similar habits. 

 It does not, however, form such large shoals and usually remains nearer the bottom. 

 At the head of Rambha Bay it was found in comparatively large numbers among 

 weeds growing in a few inches of water. 



I have recently received specimens of this species from Madras where Dr. Annan- 

 dale collected it in the Bnnur backwater, in water of specific gravity varying from 

 1 000 to 1*0045 (corrected). This record represents an extension of the known geogra- 

 phical distribution of the species, which probably extends at least all down the west 

 coast of India in suitable localities. 



UST OF REFERENCES. 



Hansen, H. J., 1910.— <( The Schizopoda of the Siboga Expedition. Siboga- 



Expeditie, XXXVII. 

 1912. — " The Schizopoda in " Reports on the Scientific Results of 

 the Expedition to the Pacific Agassiz Albat- 

 ross from August 1899 to March 1900, XVI and 



from October 1904 to March 1905, XXVII Mem. 



Mus. Comp. Zool., Harvard, Vol. XXXV, No. 4. 



Nakazawa, K , 1910.— " Notes on Japanese Schizopoda." Annot. Zool. Jap., 



Tokio, Vol. VII, p. 247. 



Sars, G. O. , 1877.—' ( Nye Bidrag til Kundskaben om Middelhavets Invertebrat- 



fauna. I. Middelhavets Mysider. ' ' Arch. f. Math. Natur. , 

 Kristiania, Ed. II, Heft I, p. 10. 



Stebbing, T. R. R., 1880.— " Gastrosaccus spiniferus, Goes, newly described and figur- 

 ed." Ann. Mag. Nat. Hist., ser. 5, Vol. VI, p. 114. 



Tattersall, W. M., 1908.— " Two new Mysidae from brackish water in the Ganges 



Delta." Rec. Ind. Mus., Vol. II, pt, III, x, p. 233. 

 1914. -" Further records of Indian Brackish Water Mysidae with 

 descriptions of a new genus and species." Rec. Ind. 

 Mus., Vol. X, pt. Ill, p. 75. 



