I9I5-] 



Fauna of the Chilka Lake : Crustacea Decapoda. 



245 



the female figured on plate xii, which is extreme in this respect, the margin only bears 

 large scattered tubercles behind the acute orbital angle ; in other females and in most 

 males the tubercles are aggregated to form 

 one or two protrusions or lobes which, in 

 some cases, are separated by definite emar- 

 ginations of the border (text-figs. lyb, lye). 



The front is one-third or a little less 

 than one-third the greatest breadth of the 

 carapace and is only very slightly deflexed. 

 Dorsally it exhibits feeble longitudinal 

 depressions in the middle and near the inner 

 border of each orbit, and theie are faint 

 indications of a pair of pre-gastric lobes. 

 The anterior margin is straight in dorsal view; but, seen from in front, it projects 

 downwards in the middle and at the lateral angles (text-fig. 16). 



The fronto-orbital border is about three quarters the greatest breadth of the 

 carapace. 1 The upper margin of the orbit is a little sinuous and is sometimes, but 

 not always, obscurely crenulate in part or in all of its course. The inferior margin 

 is evenly curved and crenulate, meeting the upper margin externally without any 

 appreciable gap or emargination. The side-walls of the carapace beneath the antero- 



FiG. 16. — Leipocten sordidulum, gen. et sp. nov. 

 Carapace of a female, seen from in front. 



b. • "• 



Fig. 17. — Leipocten sordidulum, gen. et sp. nov. 



a. Anterior portion of carapace from below, left outer maxillipede removed. 



b. Antero-lateral margin of carapace of a female from Madras. 



c. do. do. of a male from Madras. 



lateral border are smooth or feebly tuberculate and are traversed by a finely beaded 

 line that extends from the outer angle of the epistome to the enlarged tubercles above 

 the base of the last leg. The true infero-lateral border is also finely beaded. The 

 posterior border is straight in both sexes and about as long as the front; it is tra- 

 versed by two beaded lines, rather widely separated and continuous with that on the 

 infero-lateral edge. 



It varies from 0-65 to 0*8 times the greatest breadth. 



