CRUSTACEA OF THE MERGUI ABCHIPEIiAGO. 133 



In the female tlie 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 Z>. myctiroides, but in D. hrevitarsis 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. y. those of young 

 specimens of 0. ceratopJithalma. 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 upoQ 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 



