new Crab from Basra. 63 
Sesarma (Holometopus) boulengert, sp. n. 
Description.—Closely resembling S. dehaant, M.-E., from _ 
which it differs in the following characters :— 
The carapace, as a rule, is slightly wider in specimens of 
similar size. The inter-regional grooves on the posterior part 
of the carapace are rather less deep. ‘The sides of the front 
are distinctly concave. 
The merus of the chelipeds has the anterior margin rather 
more expanded distally and more coarsely dentate; the distal 
A. Sesarma boulengeri, male, holotype; Basra. Outer surface of left 
chela, 
B. Sesarma dehaani, Milne-Edwards, male ; Hong Kong. Outer surface 
of left chela, 
tooth on the upper edge is blunt and indistinct. The inner 
angle of the carpus—which in S. dehaani is rounded or 
bluntly angled, with sometimes an apical granule—is produced 
as a small but distinct and acute tooth *. The palm is more 
inflated, especially in the male ; on its outer surface is an 
obscure row of granules about the middle; above this the 
granules are larger, becoming less prominent. towards the 
upper margin; below the middle the granules are smaller 
* A specimen collected by Major C. Christy, and received since this 
was written, has the carpal angle of one of the chelipeds blunt; in the 
other cheliped the angle forms an acute tooth as described above, 
= 
