CRUSTACEA OF THE MERGUI ARCHIPELAGO. 229 
antenne. They are much shorter than the anterior margin of 
the carapace, and are a little dilated towards the cornea; each 
peduncle is marked on its upper surface with two longitudinal, 
reddish-brown lines. The external antenne are very hairy. 
The basal joint of each peduncle, which projects nearly as far 
forwards as the two triangular prominences of the anterior margin 
of the carapace, presents a few small spinules on its anterior 
margin. The next joint, which extends almost as far forwards as 
the acute tip of the rostrum, is armed with a short spine at 
the external angle of its anterior margin, but this spine is 
not represented in Milne-Edwards’s figure (J. ¢. pl. xiv. fig. 2). 
The next or penultimate joint is provided at the base of its 
upper surface with a small scale which terminates in two spines, 
which much resemble those in Milne-Edwards’s figure, the longer 
external spine projecting a little beyond the distal end of the 
penultimate joint, whereas the shorter internal spine scarcely 
projects so far forwards. As in the same figure, the inner margins 
of these spines are also spiniferous; but the spinules are more 
numerous in the Mergui specimens, for in them the external 
spine is armed with five, and the internal spine with three 
spinules. 
As the foremost of the already described transverse, piliferous, 
elevated lines on the anterior part of the cepnhalothorax are 
minutely spinulose, this region appears somewhat hairy. The 
anterior margin algo is armed with some small spinules between 
- the two lateral spinulose prominences, and some small spinules 
occur at its external angles. The surface behind the cervical 
suture is also covered with many long hairs. 
The left chelipede is much larger than the right. The arcuate, 
hairy, upper and internal margin of the meropodite of the 
larger chelipede is armed with 13-14 small acute spines, all of 
which are directed forwards; the anterior margin of the upper and 
external surface is also hairy, and presents a similar number of 
small spinules, which gradually diminish somewhat in size from 
the internal to the external angle. This somewhat hairy outer 
surface of the meropodite is almost wholly flattened and 
smooth, presenting only some small piliferous spinules and 
elevated lines on its upper part, in the angle between the 
anterior and the upper internal margins, and a few pili- 
ferous elevated lines near the distal end of the under and 
external margin. These groups of piliferous lines are united 
