224 A. Alcock — Carcinolocjical Fauna of India. [No. 2, 



53. Leucosia corallicola, n. sp. Plate VI. fig. 4. 



Carapace somewhat piriform, longer than broad almost by the 

 whole length of the front : the antero-lateral borders gradually conver- 

 ging, and coarsely crenulate up to the smooth sharp lateral borders of 

 the front : the true postero-lateral border, which is also crenulate, 

 ceases abruptly at the level of the first pair of true legs : the posterior 

 margin is quite straight with the outer angles pronounced : the epimeral 

 edge is only visible dorsally in its posterior part. 



The thoracic sinus is deep and distinct, but short and in places ill 

 defined: its longitudinal limb is bounded by 3 or 4 small (small because 

 the species is small) granules above the base of the chelipeds : the 

 edge of the pterygostomian region, which defines it in front, is convex 

 and irregularly wrinkled but not granular. 



The front is almost as in L. longifrons : it is long, strongly convex 

 dorsally, and ends in a broad triangular somewhat deflexed tip which 

 projects beyond the orbits. 



The ventral surface of the ischium of the external maxiliipeds is 

 not abnormally convex. 



The chelipeds are as in L. pallida, as are the legs. 



Colours in spirit : light yellow marbled with brownish. The 

 carapace of not quite adult females, and of the males, is 10 millim. 

 long and 8 millim. broad. 



Log. Off Malabar Coast, 29 fathoms on a bottom of " hard flat 

 coral slabs " (Alfred Carpenter). 



This species may possibly be Bell's L. affLnis (Trans. Linn. Soc. Vol. 

 XXI. 1855, p. 287, pi. xxx. fig. 6), but the front and the thoracic sinns 

 are quite different from the figures of that species. It is certainly not 

 the immature form of L. longifrons, L. hasivelli, L. pallida, or L. 

 whitmeei, to which group it belongs. Among Indian forms its closest 

 relative is L. pallida Bell. 



54. Leucosia whitmeei, Miers. 



Leucosia whitmeei, Miers, Ann. Mag. Nafc. Hist. (4) XVI. 1875, p. 342, and 

 Trans. Linn. Soc, Zool., (2) I. 1875-79, p. 238, pi. xxxviii. figs. 16-18 : J. R. 

 Henderson, Trans. Linn. Soc. Zool., (2) V. 1893, p. 397. 



Carapace piriform, longer than broad by the whole length of the 

 front ; the antero-lateral borders hardly sinuous, gradually converging, 

 and finely milled ; the true postero-lateral border, which is also finely 

 milled, ceases abruptly at the level of the interval bel-ween the chelipeds 

 and the first pair of legs ; the posterior margin, in the adult, no less 

 than in the young, almost straight, with the external angles somewhat 

 pronounced, the deflexed surface below being quite smooth ; the epi- 

 meral edge visible to dorsal view only in its posterior part. 



