154 CRUSTACEANS OF THE 



distal extremity of the penultimate joint of the anten- 

 nular peduncle. 



The first pair of legs exceed the extremity of the antennal 

 scales witli a third of the carpus , in the young specimens 

 with a fourth ; the carpus of the two adult specimens is 

 exactly twice as long as the hand, the fingers of which 

 are about as long as the palm , the chela of the younger 

 individuals is slightly more than half as long as the 

 carpus. 



The second pair of legs are a little unequal; with the 

 exception of the young male from Nanga Raoen , the right 

 leg is the larger. The right leg of the male from Nanga 

 Raoen, which measures 43 mm., is but little shorter than 

 the body. The cylindrical merus reaches almost to the 

 end of the antennal scales , the carpus and the hand pro- 

 jecting beyond it. The obconical carpus is very 

 slightly shorter than the merus, its diameter 

 at the distal end measures ^j- of its length, so 

 that the carpus is of a compact shape. The hand is about 

 three times as long as the carpus and the fingers 

 are very slightly shorter than the palm; the 

 latter is about three times as long as broad and 

 appears distinctly broader than the carpus, 

 because the palm is in the middle once and a 

 half as broad as the distal extremity of the 

 preceding joint. The palm is a little wider 

 than thick, the proportion being as 7:5; it is, 

 however, not compressed, because both the 

 upper and the under surface are transversely 

 slightly convex and because the inner and 

 outer margins are likewise rounded. The fingers 

 are slender , the index makes a concave line with the inner 

 surface of the palm ; on each finger one observes above and 

 below a longitudinal elevated ridge that runs from the arti- 

 culation to the tip. The dactylus (Fig. 3/) is armed with 

 a strong and sharp conical tooth exactly in the middle of 

 its length , a second similar though slightly smaller tooth 



Notes from tlie Leyden Museum, Vol. XX, 



