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



The front is prominent, triangular, and dorsally convex ; its length 

 is at least equal to its breadth, and it ends in a projecting laminar 

 triangular tip. 



The ventral surface of the ischium of the external maxillipeds 

 of the female is strongly convex up to a stout terminal tooth. 



The chelipeds, in the adult male, are less than one-third longer 

 than the carapace. The upper surface of the arm has both its anterior 

 and posterior borders defined by a distally-incomplete row of tubercles, 

 and, besides the basal eminence formed of 6 to 8 coalescent granules, 

 has four — rarely five or more — large tubercles disposed in an irregular 

 square just beyond the basal eminence : the inner surface of the arm 

 has a few tubercles in its proximal half, as has also the under surface in 

 its proximal fourth. The wrist is quite smooth. The hand is very 

 little longer than broad, its inner edge bears a single row of granules 

 which are often indistinct. The fingers are not much shorter than the 

 hand, and their opposed edges are crenulate — and that but indistinctly — 

 only in their distal two-thirds. 



The legs have stout, subcylindrical, perfectly smooth meropodites, 

 inflated carpopodites, propodites with a sharpish dorsal edge, and, in 

 the case of the last pair, with the ventral edge sharp also, and narrow- 

 ly lanceolate dactyli which are more than half again as long as their 

 propodites. 



The abdomen in both sexes consists of 4 distinct pieces, the third 

 piece, in the male, having a denticle in the middle line. 



Colours in spirit : carapace light yellowish-brown, with a horseshoe 

 of six impressed white spots in the gastric region, and with a narrowly 

 defined red ring in either branchial region posteriorly; legs broadly 

 banded with yellowish red ; fingers with reddish base and white tip ; 

 tubercles on upper surface of arm with red base, sharply defined, and 

 white apex. 



The carapace of an average adult male is 22 millim. long and 

 18 millim. broad, of an adult female 25 millim. long and 22 millim. 

 broad. 



Over 80 specimens of all ages, from the Andamans, Mergui, Ceylon, 

 and the Persian Gulf. 



48a. Leucosia lonqifrons, var. neocaledonica, A. Milne Edwards. 



Leucosia neocaledonica, A. Milne Edwards, Nouv. Archiv. du Mns. X. 1874, p. 40, 

 pi. ii. fig. 1 ; and ? Haswell, P. L. S., N. S. Wales, Vol. IV. 1879, p. 46 ; and ? do 

 Man, Notes Leyden Mus. III. 1881, p. 123. 



? Leucosia urania, de Man, Notes Leyden Mus, Til. 1881, p. 256. 

 This is certainly a well-marked variety, and perhaps a distinct 



