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



The chelipeds are massive and nodular, but even in the male are 

 only about half as long again as the carapace. 



The ambulatory legs have the 3rd, 4th and 5th joints compressed 

 and irregularly dentate along one or both edges. 



Our specimens, which are rather damaged, come from the Anda- 

 mans to 20 fathoms, and from off Colombo, 26^ fathoms. 



Lambrus (Parthenolambrus) harpax, Ad. and Wh. 



Lambrus harpax, Adams and White, ' Samarang ' Crustacea, p. 25, pi. vi. fig 3. 



Lambrus harpax, Haswell, P. L. S., N. S. Wales, Vol. IV. 1879, p. 450; and Cat. 

 Austral. Crust., p. 32. 



Lambrus harpax, Miers, Zoology H. M. S. 'Alert,' pp. 182 and 202; and 

 ' Challenger ' Brachyura, p. 99. 



Male. Carapace depressed semi-elliptical, as long as broad, its 

 surface almost smooth. The median region is carinated, the carina 

 bifurcating anteriorly to enclose an elongate-triangular depression 

 behind the eyes, and carrying a large spine in the gastric region 

 (at the point of bifurcation), another large spine in the cardiac region, 

 and a much smaller spine in front of the latter. 



The lateral margins are cristiform, with a series of crenations and 

 sutures indicating fused teeth ; and the hepatic region is prominent, 

 with a cristiform edge : the postero-lateral angle is surmounted by an 

 upturned laciniated tooth, the postero-lateral margins are dentate, and 

 ou the posterior border is a triangular tooth with an obscurely tri- 

 lobed tip : from the bluntly laciniated tooth of the postero-lateral angle 

 a carina runs obliquely forwards and inwards onto the posterior part 

 of the branchial region. 



The rostrum is strongly deflexed, and ends in an obscurely and 

 unevenly trilobed tip. The chelipeds in the male are nearly 2^ times 

 the length of the carapace, aud are thin and compressed, with sharp, 

 almost cristiform, edges : in the arm both the inner and outer edges are 

 unevenly dentate, and the lower edge faintly granular : the carpus has 

 the outer edge compressed and crenulate : the thin hand has its inner 

 edge crenulate, has a curved line of granules on its inner surface, and 

 some granules on its outer surface : the movable finger has its upper 

 edge crenulated at base. The ambulatory legs are compressed, with 

 the 3rd, 4th and 5th joints cristated above, especially in the last two 

 pairs : in the last pair these joints have both margins rather strongly 

 dentated. 



Our specimen is from the Andamans. 



Miers (Zoology H. M. S. ' Aleit, ' p. 202) considers L. sandrockii, 



