CRUSTACEA OF THE MERGUI ARCHIPELAGO. Los: 
In the female the terminal joint is triangular as in the male, 
and rounded at the tip; but the other joints are all enlarged 
laterally, become gradually narrow towards their posterior 
margins, and gradually decrease in length. 
The chelipedes, which are comparatively as long as those of 
D. sulcata, measuring about twice the length of the carapace, are 
nearly equal, both in the male and in the female. They are 
slender in D. myctiroides, but in D. brevitarsis are short and 
broader, in this respect resembling a little those of D. sulcata. 
The arms are short, smooth, and unarmed ; the carpopodite is 
nearly cuboid, its upper (outer) surface is smooth, convex, and 
armed at the internal angle with a small acute tooth. The 
internal plain surface of the wrist is a little hairy. The hands 
(fig. 2) are short, being only twice as long as broad (the palm 
and the fingers taken together), whereas in D. sulcata they are 
about three times as long as broad. 
The fingers are as long as or scarcely longer than the palm, 
whereas in D. sulcata the fingers are once and a half as long 
as the palm. In other respects the hands of this species much 
resemble those of some species of Ocypoda, e. g. those of young 
specimens of O. ceratophthalma. They are much compressed and 
are a little arcuate, so that the outer surface appears convex and 
the inner concave. The upper margin of the palm is cristate, 
minutely serrate and hairy, the outer surface smooth, covered 
with a few small hairs, and marked with a piliferous, longi- 
_ tudinal, elevated line, close to the under margin, to which it 
runs parallel, proceeding upon the immobile finger. The under 
margin of the palm itself is carinate, like the upper margin, and 
also minutely serrate. The compressed fingers are nearly close 
together, and their somewhat curved, pointed tips cross one 
another; the inner edges are minutely serrate or denticulate 
and piliferous. The upper margin is carinate and piliferous, the 
under margin also carinate and microscopically serrate, being a 
continuation of the under margin of the palm. The outer 
surface of the fingers is smooth and almost glabrous, but each is 
marked with a longitudinal, elevated, piliferous line on the 
middle of the outer surface, that of the index being the con- 
tinuation of the elevated line which occurs on the inferior part 
of the outer surface of the palm. The inner surface of the palm 
is slightly hairy and also marked with a piliferous line on the under 
half, which proceeds upon the inner surface of the index, and the 
