146 CRUSTACEANS OF THE 



male and in the female specimens only by the hand ; in 

 the adult male the carpus is very slightly more than twice 

 as long as the hand, in the other specimens the chela is 

 justly half as long as the carpus. The fingers are a little 

 longer than the palm. 



The second pair of legs are of moderate size and 

 subequal, the larger leg being the right or the left. In 

 the adult male from the Ketoengau river the larger left 

 leg, that is little more than half as long as the body, 

 exceeds the end of the antennal scales by the whole length 

 of the hand. The almost cylindrical merus measures ^j. of 

 the whole leg and extends to the end of the antennal 

 peduncle. At first sight the carpus appears as long as the 

 merus, but accurately measured it proves to be very 

 slightly longer than the latter. 



The carpus widens a little towards its distal end, so 

 that here its diameter measures ^j. of its whole length ; 

 this joint appears therefore moderately slender. The 

 chela is almost twice as long as the merus and 

 the fingers nearly as long as the palm; the 

 latter is about 4 times as long as broad and 

 very slightly wider than the distal end of the 

 carpus, the palm is also a little broader than 

 thick, as is proved by the measurements. The fingers meet 

 together along their whole length and each of them is armed 

 with three minute basal teeth (Fig. 2 g) ; the distance of 

 the foremost tooth of the immobile finger from the articu- 

 lation measures about ^/j of the whole length of the finger 

 and the third or foremost tooth of the dactylus is a little 

 farther distant from the articulation. The second tooth is 

 slightly larger, but the first or proximal one is the small- 

 est of all. Each finger is furnished with a sharp cutting- 

 edge between the foremost tooth and the apex. The other 

 leg is very slightly shorter, but agrees for the rest with 

 the left ; the dactylus presents four minute obtuse teeth , 

 the two first of which are a little smaller than the two 

 distal ones and the immobile finger has two teeth. The 



Notes from tlae Lieyden JMiiseizm , Vol. ^X. 



