CfiUSTACEA OP THE MERGUI ABCHIPELA&O. Ill 



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 Jength, 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 {I. c. pi. 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 

 granules. 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. Each 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 fiattened and 

 appears wholly smooth. The inner surface of the fingers also is 



