1895.] A. Alcock — Carcinological Fauna of India. 263 



The chelipeds are massive and are about three times the greatest 

 length of the carapace : their surfaces are almost smooth : the arm 

 is rhomboidal in transverse section, and the palm is sharply trigonal : 

 the lower edges of the arm, wrist and palm form a continuous line of 

 beading : the upper edge of the arm is granular and spinular : the 

 inner or anterior edges of the arm, wrist and hand are spinate — the 

 spines growing larger towards the end of the palm, while the posterior 

 (or outer) edges of the same three joints are very strongly and closely 

 laciniate. 



As usual the spines in all cases have a tendency to be alternately 

 larger and smaller. 



Of the ambulatory legs the merus, carpus and propodus have the 

 anterior (upper) border strongly and sharply carinate, while the merus 

 has also the posterior border spinate. 



This species is not uncommon along the Orissa coast, from 8 to 23 

 fathoms. 



Lambrus (Platylambrus) carinatus, Edw. 



Lambrus carinatus, Milne-Edwards, Hist. Nat. Crust., I. 358. 

 Lambrus carinatus, A. Milne-Edwards, Miss. Sci. Mex., Crust., I. p. 147 (foot- 

 note). 



Our specimens, which agree with the diagnoses of M. A. Milne- 

 Edwards completely, are distinguished from those above described as 

 L. prensor, (1) by having the mid-dorsal carina formed by three o-reat 

 compressed teeth ; (2) by the single, and very high and sharply cut 

 carina on either branchial region ; (3) by the smaller size of the spine 

 at the lateral epibranchial angle and of the spine, at the postero-lateral 

 angle, immediately succeeding it ; (4) by the form of the infra-orbital 

 lobe, which instead of being entire, is bilobed — the inner lobe, more- 

 over, having a rounded apex, and not being visible from above ; (5) 

 by the meropodites of the ambulatory legs having their anterior (upper) 

 edge serrate, not carinate, and by the carpopodites and propodites 

 having the anterior edge smooth. 



These differences are constant in a series of twelve specimens 

 including both sexes. 



This species also differs from L. prensor in its much smaller size 

 three ovigerous females having the carapace 11 millim. in its greatest 

 breadth (exclusive of spines), while ovigerous females of L. prensor 

 have the carapace 28 to 30 millim. in its greatest breadth exclusive of 

 spines. 



