1915.] Fauna of the Chilka Lake : Crustacea Decapoda. 209 



The methods employed in the capture of the specimens are detailed in the Intro- 

 duction to this volume (p. 16) ; an account of the traps used by the Uriya fishermen 

 will be published later. 



Our observations on the salinity of the water are expressed in the form of speci- 

 fic gravities. The instrument employed was calibrated for 15 °C, and to this tem- 

 perature all readings have been reduced. 



DECAPODA REPTANTIA 



Tribe OXYSTOMATA. 



Family CALAPPIDAE. 



Genus MATUTA, Fabricius. 



Matuta victor, Fabr., Hilgendorf. 



1896. Matuta victor, Alcock, Journ. Asiat. Soc. Bengal, IyXV, p. 160. 



Six small specimens that appear to belong to this species were found in March 

 1914, in the outer channel; the carapace of the largest is only 11-5 mm. in length. 

 At the time when they were obtained the water in this part of the lake was as salt 

 as that of the Sea in the vicinity; none were found during September when the outer 

 channel is filled with water which is quite fresh. 



The species, which is one of very wide Indo-pacific distribution, is evidently 

 carried into the outer parts of the lake during the inflow of salt water ; it should be 

 regarded merely as a visitor to the lake-system and not as a permanent inhabitant. 



Family LEUCOSIIDAE. 



Genus E BALI A, Leach. 



Ebalia .malefactrix, sp. nov. 



(Plate XII, fig. 1.) 



The carapace is polygonal in outline and as broad as, or a little broader than long 



(plate xii, fig. 1.) The postero-lateral borders are very long and gradually convergent 



posteriorly and the entire margin is elegantly beaded. The side- walls of the hepatic 



region form a large independent antero-lateral facet on either side of the carapace, 



extending beneath the eyes to the base of the antennulss. The margin that defines 



the lower limit of this facet is beaded like the true antero-lateral margin and, in dorsal 



view, is visible in almost its entire extent ; a little behind the middle of its length it 



protrudes slightly in the form of a large obtusely rounded angle. 



The front is finely beaded and nearly straight, with a slight and ill-defined 

 median emargination ; in dorsal view the edge of the buccal cavern is visible. The 

 antero-lateral margin in large males is obtusely angled in two places and its junction 

 with the postero-lateral margin is very prominent and sharply rectangular. The 

 postero-lateral margin is sharply angulate in its anterior third (this angle marking the 

 termination of a large granular elevation on either side of the carapace) and, in males 

 and some females, one or two of the marginal beads or tubercles in the posterior third 



