CRUSTACEA OF THE MERGUI ARCHIPELAGO. 63 
occupies the proximal third of the outer surface. In the largest 
specimen, on the contrary, the larger proximal half of the outer 
surface is granulo-spinulous, and some granules are also found at 
the proximal end of the under margin. The granules of the 
granulo-spinulous area are of unequal size and are acute; some 
larger granules are often observed in two rows on the upper 
margin, and irregularly spread over the outer surface, whereas 
others of smaller size are distributed between the large gra- 
nules. In other specimens the granules which are found on the 
upper margin are smaller than those of the outer surface. The 
somewhat convex inner surface of the palm is quite smooth in 
the three smaller specimens, but a little granular on the middle 
in the largest. The dark-coloured fingers are shorter than the 
palm, and are nearly similar to those of P. vespertilio; they 
meet along their inner margins, and have pointed, crossed tips. 
The mobile finger is covered above at its base with a few 
eranules, but otherwise it is quite smooth and glabrous, pre- 
senting, however, some longitudinal lines of punctulations. The 
inner edge is feebly denticulate, a somewhat larger (longer) 
tooth being found at the base, and the inner surface bears a few 
small tufts of short hairs along the inner edge. The immobile 
finger presents an impressed, punctate, longitudinal line on the 
outer and on the inner surface ; its inner margin is provided with 
six teeth, which are stronger than those of the mobile finger, and 
the third of which is the largest; on the inner surface this finger 
also bears a few tufts of short hairs. 
The hand of the smaller chelipede is much smaller and com- 
paratively more slender than the larger hand. The smaller hand 
is a little shorter than the other, but much lower, its height mea- 
suring scarcely more than a third of the length, the fingers 
included. The whole upper surface of the palm, including its 
upper and under margins, is covered with some large acute gra- 
nules, which are comparatively a little larger than those of the 
larger hand, and are mostly arranged in six or seven longitudinal 
rows, two of which are found on the upper margin. The inner 
surface of the palm presents some acute granules. The fingers 
of the smaller hand, which are shorter than the palm, meet 
along their inner margins, and have also pointed crossed tips. 
The lower finger is slightly deflexed, and rather profoundly 
sulcate both on its outer and its inner surface; the inner margin 
is armed with five or six teeth. The mobile finger, which is 
