268 Carcinological Fauna of India. 



being smooth and bare — except for a pimple at each of the four angles 

 of the cardiac region. On either branchial region, aboye the postero- 

 lateral angle of the carapace, is a bluntly conical spine. The rostrum 

 is very broad, and is concave and bluntly pointed : on either side above 

 the eye is a little eminence which carries a tuft of long silky hairs. The 

 post- ocular constriction is distinct, as is also the post-hepatic. The 

 antero-lateral (including the hepatic) margin is faintly crenulated : the 

 posterior border is quite smooth. % 



The chelipeds in the male are three times the length of the cara- 

 pace, but not more than 2\ times in the female : the anterior (or inner) 

 margin of the arm and hand is evenly and bluntly dentate, or crenulate ; 

 the posterior (or outer) margin in the same joints is as evenly but much 

 more bluntly and indistinctly dentate, and the lower margin faintly 

 beaded : the carpus is either quite smooth or has a few nodules. 



The ambulatory legs are smooth, rather stout, and are longer than 

 the hand. In the male near the anterior border of the 6th abdominal 

 tergum is a strong spine. This is a fairly common species at the 

 Andamans. 



Lambrus ( Rhinolanibrus ) gracilis, Dana. 



Lamhrus gracilis, Dana TJ. S. Expl. Exp. Crust., pt. I. p. 137, pi. vi. figs. 6 a-b. 

 Lambrus gracilis, Miers, ' Challenger ' Brachyura, p. 94. 



Lambrus d,eflexifr(ms, Alcock and Anderson (nee Miers), J. A. S. B., 1894, pt. ii. 

 p. 199. 



Carapace, with rostrum, considerably longer than broad ; with a 

 pronounced post-ocular constriction ; somewhat rhomboidal in shape : 

 the regions are extremely prominent, especially the cardiac, which is 

 capped by a conical tooth, and the branchial, which rises into an oblique 

 crest terminating posteriorly in a tooth : the hepatic region forms a 

 prominent tooth, behind which the rounded lateral margins are 6 or 7 

 toothed: there are two laminar teeth on the posterior border: other- 

 wise the carapace is smooth. The rostrum is broad, deflexed, and dis- 

 tinctly trilobed towards the tip. 



The chelipeds are not quite twice the length of the carapace and 

 rostrum; and in the adult are not symmetrical — one, either right or 

 left, having the hand much larger than the other. In the young the 

 asymmetry is hardly noticeable. The arm has the anterior (inner) and 

 posterior (outer) border irregularly armed with compressed blunt 

 spines, of which the one at the far end of the outer border is the largest 



being almost foliaceous : the hand has its inner and outer borders 



armed in the same irregular way, two or three of the teeth on the outer 

 border, and one on the inner border being enlarged : the under surfaces 



114 



