192 A. Alcock — Carcinological Fauna of India. [No. 2, 



Key to the Indian species of Randallia. 



I. The basal joint of the antennules forms a close- 

 fittinpf operculum to the antenri ulary fossa : 

 the whole body and appendages are covered 

 with a dense velvety pubescence : front very 



indistinctly emarginate R. lanata. 



II. The antennules fold loosely in their fossae : body 

 and appendages devoid of pubescence : front 

 distinctly bidentate : — 



1. Carapace granulous or pustulous, the 

 regions defined by grooves : — 



i. Front separated from the carapace by 

 a conspicuous transverse groove : in- 

 testinal region tumid but not culmin- 

 ating in a spine : tip of exognaths 

 (and often of adjoining points) 



blister-like B. pustulilahris. 



ii. No deep groove at the base of the 

 front : intestinal region culminating 

 in a spine, the tip of which overhangs 

 the posterior margin of the carapace : 

 end of exognaths sharp : — 



(a) Chelipeds rather elongate and 

 slender, twice the length of 

 the carapace : hand subcylin- 

 drical and rather elongate : 

 antero-later margins of cara- 

 pace with simple tubercles or 



spines R. pustulosa. 



( h) Chelipeds short and stout, less 

 than twice the length of the 

 carapace : hand short and 

 stout, its outer border, like 

 that of the fingers, very 

 sharply cristiform : antero- 

 lateral margins of carapace 

 with laminiform teeth B. lamellidentata. 



2. Carapace smooth and polished to the 

 naked eye, the regions not or hardly 

 defined : — 



i. Chelipeds rather elongate and slender, 

 more than twice the length of the 



