202 PALAEMON NEGLECTUS. 



the lower Battak-Country, near Deli, East Coast of Sumatra, 

 were referred by me to Pal. equidens Dana, a species from 

 Singapore, which is, however, rather insufiBciently known, 

 because Dana's single specimen was mutilated in its second 

 pair of feet, so that only the raerus-joint was described 

 and figured by him. In that new description (I.e. p. 454) 

 1 already observed that the merus-joint or arm of the second 

 pair of legs of Pal. equidens Dana has a more slender 

 shape than that of the freshwater Palaemon from Mergui 

 and Deli; this fact was later confirmed by me (in: Zoolog. 

 Jahrb. IX, Abth. f. System. 1897, p. 782) and I suggested 

 here the opinion that not the freshwater species from 

 Mergui and Deli, but Pal. sundaicus Heller ought to be 

 considered as identical with Pal. equidens Dana. Therefore 

 now the new name of Pal. neglectus is proposed for this 

 freshwater species, which is no doubt difierent from Pal. 

 equidens Dana as also from all its congeners : it has been 

 sufficiently described and figured by me in the two quoted 

 papers. 



Palaemon {Eupalaemon) neglectus de M. is closely related 

 to Pal. lar Fabr. The cephalothorax of the former, however, 

 is rough and scabrous anteriorly, being covered here 

 with minute spinules. The rostrum is 'j^p toothed, 

 that of Pal. lar (Figs. 1 and 5) ^=i^, and in Pal. ne- 

 glectus four teeth are placed on the carapace or the fourth 

 is situated above ' the orbital margin. Both species much 

 agree with one another as regards the relative length of 

 the joints of their 2ud pair of feet, but these legs present 

 other differences. In Pal. lar Fabr. (Figs. 2 and 4) the 

 joints of the 2nd legs are everywhere rather clo- 

 sely covered with minute sharp spinules, except 

 on the fixed finger and on the inner side of the dactylus; 

 on the outer border of the joints these spinules are slightly 

 larger than on the inner; on the inner border and on 

 the lower surface, however, larger and stouter, rather obtuse 

 teeth of a brown colour are scattered between the closely 

 arranged, minute spinules, though these teeth are also 



Notes from the Leyden IMuseum, Vol. XXVI. 



