238 Memoirs of the Indian Museum. [Vor,. V, 



The carapace of the adult female is 7-4 mm. long and 9*4 mm. broad. Its length 

 in the two males is 3*4 mm. and 2 - 5 mm. The males were, in life, of a dull grey 

 colour, faintly mottled with brown. 



The specimens from the Chilka Lake were all found in the outer channel on a 

 muddy bottom, between Satpara and Barhampur I. at a depth of from 1-2 fathoms. 

 At the time they were obtained the water was quite fresh. I have no doubt that 

 they are also to be found in the same locality when the channel is flooded with salt 

 water from the Bay of Bengal ; the fact that the species was not met with during 

 March is sufficiently explained by the rarity of its occurrence. 



Two minute examples of Camptandrium sexdentatum (carapace-length 2*3 mm. and 

 17 mm. respectively) were obtained by Dr. Annandale in the Ennur backwater, near 

 Madras, in January 1915, in water of specific gravity 1-0025. 



Stimpson' s type specimens are recorded " from a muddy bottom at the depth 

 of six fathoms, in bays of the coast near Hongkong, China." 



Subfamily SESARMINAE. 



Genus SESARMA, Say. 



Sesarma tetragonum (Fabricius). 



1900. Sesarma tetragonum, Alcock, Journ. Asiat. Soc. Bengal, LXIX, p. 420. 



A single example of this species, a male with carapace 29 mm. in length, was 

 found dead on an island in the outer channel near Manikpatna. It was obtained in 

 March 1914, at the time when the water in the channel was salt. The species is, in 

 all probability, only an occasional visitor to the lake- system ; it may possibly estab- 

 lish itself for short periods, but of this we have no evidence. 



Sesarma tetragonum is a species of very wide Indo-pacific distribution. 



Sesarma batavicum, Moreira. 

 . (Plate XII, fig. 7.) 



1890. Sesarma barbimana, de Man {nee Catio), Notes Leyden Mus., XII, p. 104, pi. vi, fig. 13. 

 1903. Sesarma batavica, Moreira (nom. nov. for S. barbimana, de Man, nee Cano 1 ), Arch. Mus. Rio 

 Janeiro, XII, p. 117. (fide Zool. Rec. for 1903.) 



The specimens from the Chilka Lake, though rather smaller than the type, agree 

 closely with de Man's description and figure. 



The small transverse rows of setae on the carapace are easily seen and are especi- 

 ally conspicuous in life, for each seta is finely plumose and usually retains a quantity 

 of soft mud. The oblique ridges at the sides of the carapace, as de Man has noted, 

 are very similar to those of 5. andersoni, de Man (the types of which I have examined). 

 The anterior ridge sometimes, but not always, projects a trifle beyond the lateral 



1 Cano, Boll. Soc. Nat. Napoli, III, p. 245 (1889). 



