CRUSTACEA OF THE MERGUI ARCHIPELAGO. lil 
external (or posterior) surfaces of the arm are also minutely 
granular. 
The upper rectangular surface of the carpopodite is covered 
with small granules, and its anterior margin is fringed with rather 
long hairs. The hand of the adult male is very large, and 
measures nearly twice the distance between the external orbital 
angles, but it never surpasses this length. The breadth of the 
palm measured in the middle between the upper and under 
margins amounts nearly to a third of the whole length of the 
hand, so that the fingers are about twice as long as the palm. 
Sometimes, however, the palm is comparatively shorter and the 
fingers are still more elongate, as represented in fig. 6. The 
slender fingers are strongly compressed laterally, and the index 
tapers regularly to the tip; but the mobile finger begins to taper 
only a little before the pointed hooked extremity. The inner 
margin of the immobile finger is armed with a tolerably strong 
tooth a little before the middle (fig. 4), but for the rest it is 
unarmed and terminates in an acute point, curved slightly 
upwards. The tooth of the immobile finger is occasionally 
little developed, and a similar hand has been figured by Milne- 
Edwards (J. c. pl. iv. fig. 12) ; and in the variety which I have 
figured in fig. 6 the index appears even wholly unarmed along 
its entire length. The inner margin of the thumb only is granular 
and it is never armed with a tooth; two somewhat prominent 
granules, however, are found on it, the proximal of which is 
situated near the articulation with the palm and the second 
immediately beyond the tooth of the lower finger. In the variety 
which I have figured (fig. 6) one of these two prominent granules 
is absent. The outer surface of the palm is everywhere rather 
coarsely granulated, and the upper margin bears two rows of 
eranules. This granulation is continued along the upper margin 
of the thumb and the lower margin of the index, but disappears 
towards the extremities of the fingers, the inner margins of which 
are also granulated. Hach finger presents an impressed line on 
its outer surface, running parallel to the inner margins. 
The inner surface of the palm is minutely granular only 
between the two more coarsely granulated oblique crests with 
which it is provided, whilst the triangular under surface, between 
the inferior oblique crest and the under margin, is flattened and 
appears wholly smooth. The inner surface of the fingers also ig 
