106 CARCINOLOGICAL STUDIES. 



The upper margin of the palm is also finely granular and 

 bears a pectinated ridge which runs in an arcuate line 

 from the distal end of the inner margin of the upper sur- 

 face to the middle of the proximal margin of it; this 

 ridge consists of nearly twenty horny teeth , which decrease 

 in length towards the posterior margin ; behind this ridge 

 still a shorter one occurs , formed by a much smaller number 

 of shorter teeth. Our species therefore differs from Ses. An- 

 dersom, the upper surface of the palm of which presents 

 seven or eight short , transverse and parallel ridges placed 

 before the principal ridge, between the latter and the 

 distal margin of the upper surface. Like in Ses. Andersoni 

 an elevated slightly sinuous line runs on the outer sur- 

 face of the palm , not far from the under margin , from 

 the articulation of the wrist to near the extremity of 

 the index. The under surface of the palm and of the index 

 is rounded, convex and smooth. The outer sides of 

 the fingers are slightly concave and thickly 

 clothed with dark brown hairs, which form woolly 

 patches, similar to those which are found in several other 

 Grapsidae; the fingers, however, are quite glabrous at 

 their tips. The upper margin of the mobile finger, which 

 is distinctly separated from its slightly concave , hairy outer 

 surface, is covered with a rowof twelve transverse 

 ridges, similar to those which ornament the dactylus of 

 Ses. Andersoni. The upper surface of the finger is somewhat 

 granular at the base on the inner and a little hairy on the 

 outer side. Both fingers have slightly excavated horny tips; 

 the inner margin of the dactylus presents four small teeth , 

 of which the distal one is a little larger than the prece- 

 ding; the inner margin of the index is armed in the 

 middle with two teeth , placed close together , and a little 

 larger than those of the mobile finger, and with a third 

 small tooth immediately before the horny tip. The inner 

 surface of the palm is finely granular, but the fingers are 

 smooth internally. 



The ambulatory legs resemble those of Ses. Andersoni, 

 Notes from tlae Leyden M-useum, "Vol. XH. 



