rathbun: decapod crustaceans. 317 



The length of the rostrum varies, reaching from the middle of the penultimate 



segment to the middle of the last segment of the antennular stalk ; the number of 



teeth ranges from 7 to 10 above (2 or 3 ou carapace), usually 7 or 8, and from 2 



7 (2) 

 to 3 below, usually 2 ; 3 specimens have the formula ^ (the number in paren- 



z 



thesis being those on the carapace) ; 4 specimens — ^ — , 1 specimen — ^ — , 1 



10(2) „ ,, 7 or 6 (3) .. , , . 



specimen — ^ — . De Man gives ; his specimens are nearly twice as 



o 1—2 



large as those at hand. 



In the largest specimen, a 9 37 mm. long, the right second claw, which I take 



to be the larger of the pair (the left one is absent), measures, merus 4.2 mm., 



carpus 3.8 mm., palm 5.7 mm., fingers 5.2 mm. In most of the chelae of the 



second pair, the palm is a little longer than the fingers ; in the few cases where 



the fingers are a little longer than the palm, the cheliped may be the smaller of 



the two, as iu the one measured by de Man. 



Bithynis (Macrobrachium) pilimanus (de Man). 



PaJaemon (Macrobrachium) pilimanus de Man, in Weber, Zool. Ergeb. Reise Niederl. 

 Ost-Indien, 1892, 2, p. 471, pis. 27 and 28, fig. 44. 



Java: Buitenzorg, fresh water ; 11 specimens mostly small ; only 3 claws of the 

 second pair present. 



