238 DR. J. G. DE MAN ON THE PODOPHTHALMOUS 
I will now describe the largest of the Mergui specimens. 
The median rostral tooth of the cephalothorax is rather small, 
triangular, acute, and in all the specimens it projects a little 
more forwards than the lateral frontal teeth situated just 
outside of the bases of the eye-peduncles. The latter are 
slender and (the basal scales included) about as long as the width 
of the anterior margin of the cephalothorax; the basal scales are 
rather small, a little longer than broad, and armed, on their 
anterior margins, with four acute spinules, the innermost of 
which is the largest, whereas the others successively decrease 
in length outwards. The eye-peduncles are longer than the 
peduncles of the external antenne, but shorter than those of the 
internal antenne. The antepenultimate joint of the peduncle 
of each external antenna is armed at the internal angle of its 
anterior margin with an acute minute spinule; a similar spinule 
is found at the external angle of the anterior margin of the 
penultimate joint. The spiniform aciculum which projects from 
the dorsal surface of the penultimate joint, extends a little less 
forward than the middle of the terminal joint of the peduncle, 
and is armed on its inner margin with a row of 6-8 acute 
spinules and with some yellowish hairs. 
In some of the specimens the right chelipede, and more espe- 
clally the right hand, is a little smaller than the left; in most 
specimens, however, they appear equal at a first sight, but on a 
more careful examination a slight difference in size is perceptible. 
In one specimen the difference of size is somewhat more con- 
siderable, so that the left chelipede of this individual appears at 
first sight larger than the other. 
In all the specimens the inner margins of the under surfaces 
of the arms are armed at their proximal ends with a more or less 
elevated dentiform tubercle, which is not acute, or scarcely so. 
The wrist is armed above with some acute spiniform teeth, three 
larger than the others being arranged in a longitudinal row along 
the inner margin. The hands are covered on their flattened 
upper surfaces with numerous acute dentiform tubercles, 
particularly crowded on their rounded outer margins and 
towards the internal margins of the palms, whereas they are less 
numerous on the middle of the upper surfaces. ive or six some- 
what larger acute teeth are situated, in a longitudinal row, along 
the inner margin of the upper surface. The under surfaces of 
the hands are almost smooth. The upper surface of the mobile 
