igiy.] 



S. Kemp : Notes on Crustacea Decapoda. 



275 



slightly tumid and are separated by broad and shallow furrows. 

 In this respect there is perhaps some approach to the condition 

 found in Halicarcinus and Rhynchoplax , but there is no trace of 

 the finely cut grooves that are conspicuous in those genera. The 

 tooth on the lower surface of the rostrum, which is well marked 

 in E. (T.) xavieri and slightly indicated in E. (T.) tinguif omits , is 

 in this species altogether absent. The dactyli of the walking legs 

 bear a series of small teeth and are not apically triunguiculate as 

 in all other Indian species of Elamena. 



Elamena (Trigonoplax) cimex has hitherto been found only 

 in the Chilka Lake, on the Orissa coast of the Bay of Bengal. 

 The specimens were dredged in fresh water, but in a situation 

 subject to great seasonal variation in salinity. 



Fig. 24. — ElameiKi {Trigunoplax) xavieri. sp. nov. 



Elamena (Trigonoplax) xavieri, sp. nov. 



The carapace closely resembles that of E.{T.) cimex in outline, 

 but the antero-lateral borders are more strongly arched ; its length 

 is to its breadth as 13 to 12. There are shallow emarginations 

 opposite the bases of the last two legs. The surface is quite flat, 

 the regions not being defined in any way, and is altogether devoid 

 of hairs; the margins are not upturned. The rostrum is a large 

 triangular plate and is flat above ; its margins are slightly convex 

 and converge regularly from the base to the apex; they are not 

 parallel at the proximal end as in E (T.) cimex. On the under side, 



