I9I5-J 



Fauna of the Chilka Lake : Crustacea Decapoda. 



229 



The surface of the carapace is strongly areolated, the depressed portions being 

 smooth, while those that are elevated bear granules. The granules are small, very 

 close-set in the male, much sparser in the female. A finely beaded line extends from 

 the posterior lobe of the antero-lateral border round the posterior margin of the 

 carapace. The upper orbital margin is not distinctly beaded, but bears scattered 

 granules similar to those on other parts of the carapace; the lower orbital margin is 

 finely crenulate. From either side of the epistome a blunt ridge, covered with gra- 

 nules, extends backwards to a point above the base of the chelipedes (text-fig. 9c). 

 The entire carapace is covered with soft silky hairs, short on the dorsum, longer at 

 the sides and very long beneath the lower orbital margin. 



When closed there is a considerable gap between the outer maxillipedes. Both 

 ischium and merus are strongly thickened along their inner margins and both seg- 



a. 



d. 



Fig. 10. — Macrophthalmus gastrodes, sp. nov. 



a. Outer maxillipede. 



b. Chela of male. 



c. Chela of female. 



d. Abdomen of male. 



ments show traces of a median longitudinal ridge. The merus is much broader than 

 long and partially overlaps the exopod (text-fig. 10a). 



The chelipedes of the male are but little longer than the carapace is broad ; in 

 the female they are shorter, about equal to the length of the carapace. The merus 

 is slender, without stridulating crest, and without the expanded and crenulate inner 

 margin found in some species of the genus; it bears two rows of long silky hairs. 

 The dorsal surface of the carpus is pubescent ; its inner face and the feebly granulate 

 ventral ridge are set with long hairs. In the male the chela is about two and a half 

 times as long as broad (text-fig. ioi), the fingers being about one and a half times 

 the length of the upper border of the palm. The inner face of the chela does not 

 bear a tubercle and, except for a strip along its lower edge, is covered by a patch of 

 long hairs that extends to the tips of the fingers. Externally the palm is quite 

 smooth, but is traversed by two impressed lines from which setae arise. The upper- 

 most of these runs longitudinally across the middle of the palmar surface and is 



