1895.] A. Alcock — Carcinological Fauna of India. 277 



The rostrum is trilobed, the small lateral lobes being formed each 

 of a group of granules, and the larger, projecting, median lobe being 

 spathulate, smooth, and somewhat deflexed. 



The surface of the carapace is somewhat granular and eroded, but 

 this is often concealed by a glazing of stony algae. 



The orbits have the edges finely and evenly serrate. The third 

 joint of the antennal peduncle is spiniferous. 



The segments of the sternum, as also the abdominal terga, are all 

 deeply cut, and their surface, like that of the external maxillipeds and 

 pterygostomian regions, is very sharply, closely and evenly granular. 



The chelipeds in the male are 2§ times the length of the carapace ; 

 in the female hardly twice that length : in both sexes they are top- 

 heavy, owing to the distal enlargement of the palm and the great size 

 of the fingers ; they are everywhere granular, but most markedly so 

 on the under surface : the inner border of the arm and palm, and the 

 upper border of the movable finger, are irregularly spinulate, the outer 

 border of the hand may have two or three irregularly disposed blunt 

 teeth, and that of the arm a few spicules. The ambulatory legs charac- 

 terize this species, for the meropodites, in all, are compressed-trigonal 

 with all three edges strongly, sharply and closely spinate ; the anterior, 

 and often also the posterior, margins of the next two joints also are 

 spinate or dentate. 



Greatest length of carapace 



,, breadth ,, 

 Length of chelipeds 

 Loc. Off Ceylon 32-34 fms., and off the Andamans, 41 fms. 



Lambrus (Parthenolambrus) tarpeitis, Ad. and "Wh. 



Lambrus tarpeius, Adams and White, ' Samarang ' Crust., p. 35, pi. vii. fig. 2. 

 Lambrus tarpeius, Miers, ' Challenger ' Brachyura, p. 99. 



Carapace covered with numerous large nodules, and with the divi- 

 sion into three lobes — a median and two lateral — well-marked. The 

 hepatic region not only projects very strongly forwards, but is brought 

 into greater prominence by the fact that the carapace is somewhat 

 contracted behind the eyes, and excavated and constricted behind the 

 hepatic regions themselves : the antero-lateral margins are crenulate ; 

 the produced postero-lateral angle ends in a rounded lobe-like spine, 

 and the posterior and postero-lateral margins are irregularly and blunt- 

 ly toothed. 



The rostrum, which is deeply excavated and considerably deflexed, 

 ends in a blunt point. 



Male. 



Female. 



10*5 millim. 



9 millim, 



105 „ 



9 „ 



29 



15-5 „ 



