148 CRUSTACEANS OF THE 



adult male. The palm , very slightly shorter than the fin- 

 gers, is distinctly wider than the distal extremity of 

 the carpus and appears a little less thick tban broad, 

 about in the same proportion as in the adult male. The 

 immobile finger presents 5 obtuse teeth , the dactylus 4. 

 The chela of the other leg is narrower , but the fingers 

 have the same toothing. 



Amongst the three ova-bearing females from Nanga Raoen 

 the two legs of the second pair are only present in one. 

 The right leg is the larger, measures '^/j the length of 

 the body and exceeds the end of the antennal scales by 

 a third of the carpus. The latter, again very slightly 

 longer than the merus, has the same form as in the adult 

 male from the Ketoengau river , the diameter at the distal 

 end being '/. the length. The chela is likewise almost 

 twice as long as the merus, and the fingers are but very 

 slightly shorter than the palm , that is distinctly wider 

 than the distal end of the carpus and a little wider than 

 thick ; the immobile finger is armed again with 5 , the 

 dactylus with 4 obtuse teeth , the foremost of which is 

 but little farther distant from the apex than from the 

 articulation , as in the other specimens. The left leg is a 

 little shorter , the carpus somewhat more slender and the 

 palm scarcely wider than the end of the carpus ; the tooth- 

 ing is the same. 



The second female bears only the smaller leg and in the 

 third both are wanting. 



One leg is only present in the young male from Sin- 

 tang and this leg agrees with the described, as regards 

 its characters and the length and dimensions of its joints. 

 The chela is comparatively shorter than in the adult spe- 

 cimens , being once and a half as long as the merus; the 

 fingers, each of which is still only armed with three teeth, 

 are scarcely longer than the palm , that is distinctly wider 

 than the end of the carpus and somewhat less thick than 

 wide. On the dactylus the distance of the third or foremost 

 tooth from the articulation measures one third the length 



Notes from the Ley den. jMuseum , Vol. XX. 



