1887.] J. Wood-Mason — Description of Ljreid\is channeri. 207 



pressions, extending rather more than half way to the posterior margin, 

 and slightly converging as they go ; and two oblique elevations, situated 

 about midway between the median carina and the postero-lateral mar- 

 gins, with which they are parallel, are present on the posterior third of 

 the carapace. 



The eye-peduncles have the same form as those of L. tridentatiis^ 

 and reach nearly to the level of the end of the rostrum, but the eyes 

 they carry are in process of reduction to the condition of those of so 

 many Reptant and Brachyurous Crustacea that inhabit the muddy depths 

 of the sea, and, moreover, are unequally reduced on the two sides of 

 the body, the left being represented by an oval and convex obsoletely 

 faceted, thick, and opaque-yellow cornea, situated, as in the typical 

 species of the genus, on the outer apex of the peduncles, with the 

 subjacent pigment showing through the integument at its base as a 

 dark lead-coloured circumferential band, while all that is to be seen in 

 the corresponding part of the right eye is a smooth and very slightly 

 convex area marked out by the transparence of the pigment of the 

 subjacent ophthalmic tract. 



The propodite of the chelipeds is armed below with two acute 

 triangular spines, of which the distal is twice the size of the proximal ; 

 its low dorsal crest ends distally in a small tooth ; the cutting process 

 of its inner edge is divided into five irregular tooth-like lobules ; 

 and its tip is strongly hooked or incurved. The cutting edge of the 

 dactylopodite is obsoletely two-toothed. The only armature of the 

 carpopodite is a single long and acute spine, answering to the distal of 

 the two in L. tridentatus. The meropodite bears a sharp spinule in the 

 place of the tubercle seen in the typical species. The dactyli of the 1st 

 and 2nd pairs of legs are shorter and broader, particularly those of the 

 former, and the crests of the two preceding joints in the former also are 

 all more lamellar, the dorsal ones being in addition distally produced to 

 sharp teeth. No direct comparison of the 3rd pair of legs in the two 

 species is possible, as these limbs are wanting in the only specimen of 

 the Japanese form available for comparision, but, judging from DeHaan's 

 figure, the two last joints would appear to be much more expanded in 

 the Indian one. All the legs are slenderer. 



The third and fourth abdominal terga each bear a very sharp re- 

 curved spine in the middle line. 



Dr. Giles notes that the animal was in life, *' except a little brown 

 tint in front, of a uniform salmon colour ;" and in the spirit- specimen 

 all the upper surface of the carapace in front of the transverse impres- 

 sion, with the exception of the lateral spines, is still darker coloured 

 than the rest of the body. 



