eathbun: decapod crustaceans. 317 



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

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

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



7 (2) 

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

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



10 (2) T. ,, . 7 or 6 (3) ,. . , , . 



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



o 1 — Ji 



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 in the one measured by de Man. 



Bithynis (Macrobrachium) pilimanus (de Man). 



Palaemon {Macrohniclnuin) 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. 



