212 Memoirs of the Indian Museum. [Vol,. V, 



species; thus, (i) the margin of the front and orbits is not beaded, (ii) the granular 

 ridges on the carapace, though arrow-shaped, are less strongly elevated and are 

 covered only with minute granules and the other tubercular ridges found in E. male- 

 factrix are absent, (iii) the posterior margin bears two tubercles in the female and 

 three large petaloid processes in the male, (iv) the chelipedes and walking-legs are 

 decidedly longer than in the allied species and the fingers in the male are only two- 

 thirds the length of the palm, (v) the apex of the merus of the outer maxillipedes is 

 deeply notched, and (vi) the penultinate segment of the abdomen of the male does 

 not bear a tubercle. 



Ebalia hypsilon, found at Thursday I., is perhaps even more closely allied; but 

 in this species, according to Ortmann's figure and description, the ribs on the cara- 

 pace do not form a connected arrow-shaped ridge. The lateral ribs are Y-shaped and 

 are widely separated from the raised area on the cardiac region which bears three 

 isolated rows of large tubercles. There is a disconnected rounded patch of tubercles 

 on the intestinal region and those found on the anterior part of the carapace in E. 

 malefactrix are apparently absent. Moreover the entire upper surface of the cara- 

 pace bears fine scattered granulations and the pterygostomian ridge is not angulate 

 in the middle. 



This species, which was found on twenty-seven occasions, is by no means un- 

 common in the Chilka Lake. In the main area it does not occur in great abundance, 

 but has been found from Rambha in the south to Nalbano in the north, at depths 

 ranging from a few inches to 8| ft. In the outer channel it occurs on muddy ground 

 near Satpara and Barhampur I., but is not found on the sandy bottom nearer the 

 mouth of the lake. 



Ebalia malefactrix seems to prefer water of low salinity. At the period when the 

 outer channel was at its saltest (in March) it was scarce, but in the same locality in 

 September, when the water was quite fresh, it occurred in abundance. Ovigerous 

 females were caught in the months of March, September and October in water of 

 specific gravity varying from i - ooo to i - on. 



Specimens of this species were found by Mr. Gravely in September 19 14, in the 

 backwaters of Cochin, near Ernakulam, and others were obtained by Dr. Annandale 

 in January 1915, in the backwater at Ennur, near Madras (sp. gr. 10025). Ovi- 

 gerous females were caught on both occasions. 



The type specimens are registered in the books of the Indian Museum under 

 no. 8941/10. 



Genus PHILYRA, Leach. 



Philyra alcocki, sp. nov. 



(Plate XII, fig. 2.) 



The carapace is suborbicular and longer than broad in the proportion of 12 to 11. 

 The whole upper surface is microscopically granulate and is covered with rather 

 coarse and distant pits (pi. xii, fig. 2). . 



The front is somewhat produced, more so than is customary in the genus, and is 



