254 



Records of the Indian Museum. 



[Vol. XIII, 



The rostrum is composed of three narrow lobes with rounded 

 extremities; the median lobe is longer than the two others, and its 

 apex is situated on a lower level. 



The antennules, when folded, are concealed beneath the 

 rostrum ; at their base the}' are separated by a prominent septum. 

 The epistome is of moderate length. As in R. wood-niasoni the 

 external maxillipedes are slender and do not nearly close the 



Fig. 4. — a-c, Rliynichoplax ivood-niasoiit (Alcock). 

 if-g, Rhyiiclioplax alcocki, sp. nov. 



a, d. — Rostrum, eye and antero-lateral margin of carapace. 



b, e. — Chela of male (denuded). 



c, f. — Abdomen of male. 



?. — Terminal part of dactylus of penultimate leg. 



buccal cavern. The ischium is produced at its inner distal angle 

 and the merus is expanded antero- externally, partially concealing 

 the exognath. 



The chelipedes in both sexes are stouter than the walking 

 legs, the chelae of the adult male being particularly large. In the 

 male the merus bears a conical tooth near the end of its lower 

 margin and a series of some five large blunt teeth superiorly. 



