174 DB. J. G. DE MAN ON THE PODOPHTHALMOTJS 



cate rugose lines, and an elevated line is seen on the outer 

 surface of the palm, not far from tlie 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 S. 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 

 Grapsidce. 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 



