ibaa 
CRUSTACEA OF THE MERGUI ARCHIPELAGO. 191 
is comparatively narrow, especially in the male, scarcely measuring 
‘a third of the distance between the extraorbital teeth. 
The third joint of the outer foot-jaws is longer than broad, 
the proportion of its length to the breadth being as 5:3. In 
the shape of the male abdomen, this species nearly agrees w th 
S. teniolata or S. bidens (de Haan, J. c. pl. xvi. fig. 4). The 
terminal joint is a little longer than broad at the base, the 
penultimate about one half as long as broad at its base, and the 
following joints appear successively larger and shorter. In the 
largest female without eggs, and therefore probably not yet full- 
grown, the terminal somite of the abdomen is only partially 
pushed into the penultimate. 
The anterior legs are very similar to those of S. Hdwardsz, but 
the hands are somewhat more elongate. They are equal to one 
another, as in S. teniolata and S. Edwardsi. The ischiopo- 
dites are armed anteriorly with a smail acute tubercle near the 
articulation with the arm. The anterior margin of the latter is 
armed with some acute tubercles and with a somewhat larger 
acute tooth a little before its distal end; the upper margin is 
transversely rugose, and the inferior margin is armed with some 
acute tubercles. The outer surface of the arm is transversely 
rugose, but the inner and the under surfaces are quite smooth, 
the former being provided with the usual rows of hairs. The 
upper surface of the wrist is covered with granules and with 
minutely granulated oblique lines, and many small acute tuber- 
cles are seen along the inner margin. The hands are about 
twice as long as high, and the fingers are a little shorter than the 
palm. The convex outer surface of the latter is everywhere 
covered with small, more or less acute tubercles, which change 
into minutely granulated, oblique, elevated lines towards the arti- 
culation with the wrist. Similar granules are found also on the 
upper surface of the palm, and the inner margin of its upper 
surface is armed with some small acute tubercles, of which the 
distal one, placed near the articulation of the thumb, is some- 
what larger and dentiform. The convex inner surface of the 
palm is granular, but never presents a granulated crest. There 
is no gap between the fingers, which have a smooth, though some- 
what punctate outer surface. The mobile finger is but little 
arcuate, and its upper surface is armed with many small acute 
tubercles or teeth, which are found also on the under surface of 
the index ; the fingers, which are slightly excavated before their 
