DUTCH BORNEO-EXPEDITION. 77 



high as long. The lower margin of the palm is contex 

 and makes thus no straight line with the index. The con- 

 vex outer surface of the palm is covered with extremely 

 shallow, small depressions or foveae, giving it a reticu- 

 late appearance and the interspaces between them show, 

 under a magnifying, glass, a minute granulation; 

 one observes under a lens also a fine punctulation , more 

 distinctly in the younger males than in the adult. The 

 sliglitly compressed fingers are moderately slender and 

 leave, in the adult, a narrow interspace between them 

 when closed ; they are covered, from their base untill the 

 pointed extremities, with an extremely fine and 

 close granulation, hardly visible to the naked eye. 

 The fingers are not at all grooved, the fine puncta, 

 however, are arranged more or less distinctly in longitudinal 

 rows. The dactylus is somewhat curved and both fingers are 

 multidentate; the immobile finger (Fig. 4^^) is armed with 

 about 20 small conical and unequal teeth of which the fifth 

 and the eighth are somewhat larger and more prominent than 

 the others. The teeth of the dactylus are a little smaller, 

 also unequal, one in the middle is larger than the rest. 



The smaller chela of the adult male is, horizontally 

 measured, just as long as the cephalothorax and twice 

 and a half as long as high ; the fingers are a little longer 

 than the palm, in contact throughout their length and the 

 dactylus is less curved. In its other characters this hand 

 agrees with the other. 



Unfortunately in the adult female the immobile finger 

 of the right hand, that is but very slightly larger than 

 the other, is broken off and in the other female all legs 

 are lost. The hands are much smaller than in the male, 

 the horizontal length of the right chela measures three fourth 

 the length of the carapace , the other is only 2 mm. shorter ; 

 the fingers of the right hand are about as long as the 

 palm, in the other they are slightly longer. The teeth are 

 smaller, but for the rest they resemble the hands of the male. 



In the type of Pot. borneense in the Berlin Museum 



Notes from tlie Leyden ^luseum. Vol. X.^1. 



