324 DE. J. G. DE JMAN ON SPECIES OF PAL^MON 



Table of the West-African Species of the Genus Pal.emon, Eabr., 



CONTAINED IN THIS PaPEK. 



Miss E-athbun, in her instructive paper " The Decapod Crustaceans of West 

 Africa " (Proc. U.S. National Museum, vol. xxii. 1900, p. 315), mentions four species 

 of the genus Palcsmoii as inhabiting West Africa. Three species ought now to be added 

 to them, viz., P. (Uupalcemoii) Foal, Cout., another undetermined species of the same 

 subgenus from the Upper Congo (Coutiere, op. cit. p. 519), and finally the species from 

 Catumbella belonging to the subgenus Macrohracliium, related to P. Iheringi, Ortm. 

 Some principal characters of the five species described in this paper are the follovring : — 



A. Large clielipede with palm cylindrical. (Subgenus Eupalamon.) 



3 or 3 



a. Rostrum ^ ■ " "'" ' — ^ dentate. 



4, 6, or b 



Apical teeth of the upper margin usually present. 

 Anterior pair of spinules situated before the middle of the telson. 



Carpus of second legs longer than merus, always longer than palm, fingers covered with felt. 

 1 P. macrobrachion, Herklots. 



/3. Rostrum s dentate, no apical teeth. 



Anterior pair of spinules situated immediately behind the middle of the telson. 

 Carpus of second legs longer than merus and longer than palm, fingers without felt. 



P. Foai, Cout. (River Kribi.) 



B. Large chelipede with palm more or less compressed. (Subgenus Macrobrachium.) 



4 or 5 



y. Rostrum „£g- dentate, no apical teeth. 



Carpus of second legs about as long as merus or a little shorter, always shorter than palm. 

 Three posterior legs slender. 



P.jamaicensis, Herbst, var. Vollenhovenii, Herklots, and var. 7 angolensis, de M. 



3-5 



h. Rostrum (^^ ^^^ ."^.^^ °^ ^ dentate, apical teeth present. 



4-7 



Carpus of second legs about as long or slightly longer than merus, either a little longer or a little 



shorter than palm. 

 Posterior legs slender P. 0/fersii, Wiegm. 



4 



Rostrum v dentate, no apical teeth. 



Carpus of second legs about as long as merus, but not longer than it, slightly shorter than palm. 



Posterior legs, also the others, thicker than those of the two preceding species. 



Palcemon sp, (Catumbella.) 



