= 
CRUSTACEA OF THE MERGUI ARCHIPELAGO. 195 
milli. 
Length of the dactylopodites of the longest pair of 
[OS ohie'd Be gg eee eer om er ee 103 
S. Kraussit has been recorded by White from Singapore as 
S. longipes. S.angustifrons, trom the Sandwich Islands, is a dis- 
tinct species, being distinguished, according to A. Milne-Edwards, 
by the inner surface of the hands being armed with a strong 
transverse crest. 
Genus Cristocetoma, Alph. M.-Hdw. 
This genus hitherto contained a single species, described by 
M. Alph. Milne-Edwards, from the shores of New Caledonia. 
The Mergui collection contains a small species which certainly 
belongs to the same genus. The Clistocwlome are closely allied 
to the Sesarme proper, but may be distinguished by the shape of 
the carapace, the antero-lateral margins of which are peculiarly 
compressed and toothed, and by their external antenne being 
excluded from the orbits. 
105. Cuistocetoma Mereuiensis, n. sp. (PI. XIII. fig. 10.) 
A single female specimen, without eggs, was collected at 
Kisseraing Island. 
This new form differs from C. Balanse by its comparatively 
more enlarged carapace and by the form of the front, the 
external lobes of which are undivided. The rather thin cephalo- 
thorax is much broader than long, the proportion of the distance 
between the external orbital angles to the length of the carapace 
being as 9: 74 (in C. Balanse as 9: 8+). The upper surface is a 
little convex transversely, and the regions are tolerably distinct, 
although separated by rather shallow grooves; the whole surface 
is covered with a short, close down, and appears minutely punc- 
tate when seen under a strong magnifying-glass. The front 
is broad, as in C. Balanse@, and vertically deflexed; the anterior 
margin is slightly emarginate in the middle, but does not project 
horizontally. The postfrontal lobes are little prominent and 
separated by shallow grooves ; the rounded internal lobes are a 
little broader than the external, which are still less prominent 
and not divided into two tuberculiform prominences as in 
CO. Balanse. 
The anterior half of the lateral margin of the cephalothorax 
13s 
