1896.] A. Alcock — Carcinological Fauna of India. 295 



The rostrum consists of a simple flat acutely -triangular spine ; on 

 either side of it, projecting beyond it, separated from it by a deep bight, 

 and parallel with its tip, is a long acicular spine forming the external 

 orbital angle. The fronto-orbital region is hairy. 



The gradually convergent antero- lateral borders are about two- 

 fifths the length of the postero-lateral borders, the junction of the two 

 borders being occupied by a long oblique acicular spine ; and neaily 

 midway between this spine and the spine at the external angle of the 

 orbit on either side, is another similar but rather shorter spine. The 

 postero-lateral borders are defined in more than their posterior half by 

 a very fine raised line. 



The surface of the carapace is finely and closely punctulate in all 

 its anterior half, as are also the pterygostomian regions. 



The eyestalks are broad and flat, and taper to the cornea, which 

 has a somewhat lateral position and is a little deficient in pigment. The 

 arms have a spine or two little spines near the middle of their dorsal 

 surface : the wrist has a large spine in the distal half of its upper 

 border : the hand has its outer (upper) edge carinate up to a subterm- 

 inal denticle, and has its lower edge cut into two or three sharp 

 teeth : the dactylus has its cutting edge faintly and irregularly sinuous, 

 but by no means denticulate, and the opposed edge of the immobile 

 finger is irregularly and rather bluntly jagged. The legs are almost 

 free from hair, a few hairs occurring on the posterior edge of the pro- 

 podite and dactylus of the third pair and on the last two joints of the 

 rudimentary fourth pair only : in the first and third pairs the carpus is 

 dorsally carinate and the propodite foliaceously expanded, in the first 

 and second pairs the dactylus is little more than broadly palmulate, and 

 in the third pair the dactylus is foliaceous. The third and fourth ab- 

 dominal terga are armed each with a median recurved spine, in both 

 sexes. 



The largest female in the Indian Museum collection has the cara- 

 pace 28"5 millim. long, a smaller ovigerous female has the carapace 

 26'5 millim. long. 



Wood-Mason established his two species on two specimens, one of 

 which — L. channeri — had suffered a good deal from breakage and 

 imperfect re-growth about the frontal region. 



A considerable series of the specimens since obtained shows that 

 the two supposed species are really one. 



In the Indian Museum collection are numerous specimens, from 

 the Andaman Sea 220 to 271 fms., from the Bay of Bengal 200 to 405 

 fathoms, and from both sides of Ceylon 296 to 406 fms. 



Uniform salmon-colour in life, white in spirit. 



