I9I5-] 



Fauna of the Chilka Lake : Crustacea Decapoda. 



257 



obtained in March on the shores of Nalbano I. in water of specific gravity i - oo8. 

 The two immature individuals were found in September in water that was almost or 

 quite fresh. Both were taken in soft muddy sand; one at Nalbano I. and one near 

 Barhampur I. in the outer channel. The species apparently lives only in mud 

 mixed with a considerable proportion of sand. It is doubtless a permanent inhabi- 

 tant of the lake, able to exist in water of specific gravity varying from i-ooo to 

 1-0265. 



The precise locality of the subfossil Siamese specimen is not stated. It was 

 found while cutting a canal at a great distance from the sea. 



CO. 



Fig. 22.— Upogebia {Upogebia) heterocheir, sp. nov. 



a. Antenrmle, dorsal view. c. Third maxillipede. 



b. Antermal peduncle, lateral view. d. First peraeopod of male. 



e. First peraeopod of female. 



Subfamily UPOGEBIINAE. 

 Genus UPOGEBIA, Leach. 



1903. Upogebia, Borradaile, Ann. Mag. Nat. Hist. (7), XII, p. 542. 



The single species of this genus found in the Chilka Lake is remarkable for the 

 differences that exist between the sexes in the form of the first pair of legs. In the 

 male these limbs are sub-chelate, whereas in the female they are monodactylous. 



Upogebia (Upogebia) heterocheir, sp. nov. 



(Plate XIII, figs. 6, 7.) 



The rostrum is slightly inclined downwards and reaches beyond the end of the 



eyes by nearly half its length. In dorsal view it is narrow with a rather sharply 



rounded apex which is not provided with teeth or spinules (pi. xiii, fig. 6). The 



