174 DR. J. Ge DE MAN ON THE PODOPHTHALMOUS 
cate rugose lines, and an elevated line is seen on the outer 
surface of the palm, not far from the under margin and parallel 
to it, proceeding from the articulation with the wrist to the 
acute tooth which is found on the inner margin of the index. 
On the upper surface of the palm, near the inner margin, 
many oblique, minutely pectinated ridges run parallel to one 
another, namely, two longer ridges near the inner margin, 
and seven or eight shorter ones more outwards. The inner 
surface of the palm is a little granular. In the larger hand 
of the adult male the fingers are sometimes widely gaping, the 
mobile finger being much arcuate; but in other and younger 
specimens there is no gap between them. The upper surface 
of the mobile finger is covered with a row of thirteen or fourteen 
transverse ridges, and is moreover somewhat granular at its 
base, especially on the inner side. The outer and inner sur- 
faces of the fingers are smooth ; the fingers have horny, some- 
what excavated tips. The inner margin of the thumb is armed 
at its base with two strong teeth, the internal one exceeding 
the other in size when the fingers are gaping; immediately 
before the horny tip both fingers are armed with a somewhat 
larger tooth. The index is armed, moreover, with seven or eight 
teeth, one of which, situated nearly in the middle, is much larger 
and stronger than the others. 
In the adult female the chelipedes and also the hands are much 
smaller than in the male; they have, however, the same form 
and structure, but the pectinated ridges on the upper margin of 
the palm are rudimentary or absent and the upper margin of 
the thumb presents no transverse ridges, being only somewhat 
granular at the base. 
In their outer appearance the ambulatory legs resemble those 
of 8. aspera, but differ from that species, and almost from all other 
representatives of the genus Sesarma, by the structure of the 
meropodites. The upper or anterior margins of the meropodites 
do not terminate at their distal ends in a spine, but the 
posterior margins are denticulate, much as in some typical 
Grapside. Four or five teeth are found at the distal angle, 
the proximal tooth being the largest, and the others diminish 
gradually in size towards the articulation with the carpo- 
podite. The outer surface of the meropodites is somewhat 
transversely rugose and granular. The other joints are unarmed, 
but a little hairy. The dactylopodites are comparatively much 
