DUTCH BORNEO-EXPEDITION. 157 



The ambulatory legs are moderately slender. The 

 breadth of the propodi of the third pair measures '/,o — Vii 

 of their length , the dactyli of the adult individuals measure 

 1/3 of the propodi or slightly less, in the young specimens 

 they are slightly longer. The propodi of the fifth pair are 

 as usually a little more slender, their breadth measuring 

 1/,^ — 1/,. of their length; the dactyli measure in the adult 

 •/^ of the propodi , in the younger specimens they are a 

 little longer. I may add that the meri of the third pair 

 of the largest male are 4,6 mm. long and seven times 

 as long as broad. 



The ambulatory legs are a little hairy , short fine hairs 

 being distributed over their joints. 



Palaemon [Parapalaemon] Horstii de M. from Celebes 

 is an allied species, but has a larger size. The chela of the 

 second pair of legs, however, is not broader than the 

 carpus, the fingers are considerably shorter than the 

 palm and less slender, the ambulatory legs finally are 

 still more robust , the meri of the 3rd pair e. g. are only 

 five times as long as broad. 



Pal. {Macrobr.) hariensis de M. from Flores is likewise 

 a species of small size. The rostrum is shorter and armed 

 on the upper margin with 12 — 16 teeth. The hand of 

 the second legs is broader in proportion to the distal 

 extremity of the carpus and the palm is more com- 

 pressed, namely in the proportion of 7 : 4'/2 and its 

 inner margin is rather sharp; the palm is covered 

 with minute rounded tubercles that stand not close together 

 and the fingers of the larger chela are considerably shorter 

 than the palm. 



Pal. (Macrobr.) pilimanus de M. from Sumatra is also 

 a quite different species. 



Pal. callirrhoë is represented in the State of Santa 

 Catharina, Brazil, by Pal. potiuna F. Mull., to which it 

 is most closely allied. (Confer: Ortmann , Os camaroes da 

 agua doce da America do sal , in : Revista do Museu 

 Paulista N". II, 1897, p. 209, PI. I, fig. 9). 



Notes from the Leyden Museum, Vol. XX. 



