I9I5-] 



Fauna of flic 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 ahnost 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 apparentl}- 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-qco to 

 1-0265. 



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

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



Fig. 22.— Upogehia [Upogcbia) Iieterocheir , sp. nov. 



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



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



f . First peraeopod of female. 



Subfamily UPOGEBIINAE. 

 Genus UPOGEBIA, Leach. 



1903. Upogehia, 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 (Upogebiaj 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 visw it is narrow with a rather sharply 

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



