232 A. Alcock — Carcinolo'gic'al Fauna of India. [Xo. 2, 



proximal end of the ventral border : all the surfaces of the arm, how- 

 ever, are practically smooth, for although there are a few small tuhercles 

 at their proximal ends, these are covered and almost concealed by a 

 dense adherent encrusting spongy pubescence, which is specially well 

 marked on the upper surface. The surface of the wrist is quite smooth, 

 except for two or three tiny granules along the inner edge of the upper 

 surface. The hand is nearly as broad as long, and its inner surface 

 is bounded by two prominent longitudinal rows of. sharp-cat bead-like 

 granules, which are continued some way along the immobile finger. 

 The fingers are nearly as long as the hand, and are stoutly denticulate 

 along the whole extent of their opposed edges. 



The legs have the meropodites much compressed, those of the first 

 three pairs being sharply squared, with four sharp longitudinal lines 

 of granules, and those of the last pair being broadened and carinated 

 ventrally as well as dorsally ; the carpopodites, in all, are compressed 

 and strongly carinate dorsally ; the propodites are compressed and 

 strongly carinate both dorsally and ventrally; and the dactyli are 

 broadly lanceolate. 



The abdomen, in the male, to external view, consists of only 3 dis- 

 tinct pieces, the second piece bearing a tiny denticle in the middle line. 



Colours in spirit :■ stone blue with indefinite longitudinal stripes of 

 darker hue ; chelipeds, above, livid purplish-blue ; legs yellowish. 



The carapace of an adult male is 23 millim. long and 20 millim. 

 broad ; of an adult female, 2T5 millim. long and 19 millim. broad. 



In the Museum collection are 2 adult males and 3 adult females 

 from the mouth of the R. Hooghly. 



62. Leucosia vittata, Stimpson. 

 Leucosia vittata, Stimpson, Proc. Acad. Nat. Sci. Philad., 1858, p. 159. 

 Differs from L. craniolaris, adults of both sexes being compared, 

 only in the following particulars : — 



1. The antero-lateral borders are distinctly emarginate behind 

 the hepatic regions, the emargination being caused by the encroachment 

 of the outer limb of the thoracic sinus, and being plainly visible, 

 dorsally, when the carapace is held, without any inclination, straight 

 in front of the observer's eyes. 



2. The hand is very appreciably longer than broad, and the fingers 

 are every bit as long as the hand. 



3. The colours iu spirit are : carapace blackish blue, or nearly 

 black, with flame-coloured stripes ; chelipeds from the distal fourth of 

 the arm to near the tips of the fingers, smoky flame-coloured on both 

 surfaces, as are also the legs ; under surface of body ruddy brown. 



