i80 PALAEMON JAVANICUS. 



SO that the females of both species (the Museum contains 

 only female specimens of Pal. hrevicarpus) may be distinguis- 

 hed almost enclusively by the different shape of the rostrum : 

 the rostrum of the Japanese form is less straight, somewhat 

 more convex upon the eyes , and always the jive last teeth 

 on the cephalothorax are posterior to the eyes ; there are 

 only 2 or 3 teeth on the inferior margin , which are situated 

 more backward than in Pal. Volleyilwvenii ; the carpopodite 

 of the second pair of legs is somewhat less slender, and 

 the fingers are always a very little longer than the palm , 

 while they are a very little shorter than the remaining part 

 of the hand in the African species ; for the rest these forms 

 do not present other differences. 



Palaemon Javanicus Heller. 



Heller, Sitzungsber. Wien. Akad. Bd. 45. p. 421 taf. H, 

 fig. 48. — von Martens, Archiv. fur Naturgesch. 1868. 

 p. 45. 



The Museum is in possession of one well-preserved male 

 specimen, collected by Mr. Semmelink at Bezoeki (Java), 

 and of five specimens (1 cf , 4 9) found by Mr. Bleeker at 

 the same island. 



These specimens , though all undoubtedly belonging to 

 Pal. Javanicus Heller, present however some interesting 

 individual differences, which it will be necessary to des- 

 cribe. 



In the male specimen of Bezoeki , having a length of 

 85 mm., the rostrum is very slender, reaching a little 



beyond the scale of the external antennae , and - toothed ; 



the three posterior teeth are situated on the cephalothorax , 

 and the first tooth is placed close to the apex, being 

 separated from the preceding by a somewhat greater inter- 

 val than the other ones. The legs of the second pair are 



Notes from, the Leyden Mwseum. 



