PODOPHTHALMOUS CRUSTACEA. 69 



19. Sesarma elegans Herklots. 

 Herklots, 1. c. pag. 10. Milne Edwards, op. cit. p. 187. 



This species presents some resemblance to Aratus Pisonii 

 M. Edw. , but the seventh somite of the abdomen of the 

 female is included by the sixth, as in the true Sesarmae, 

 so that this species may not be ranged in the genus Aratus. 

 It may be distinguished at once from Aratus Pisonii M. 

 Edw. by a less elongated carapace and by the more 

 slender legs. 



20. Grapsus j^usillus de Haan. 



Fauna Japon: p. 59, pi. XVI, fig. 2. Milne Edwards, 

 Ann. Scienc. Nat. p. 175. 



This species, which belongs to the genus Nautilograpsus 

 M. Edw. , is undoubtedly different from Nautilogr. minutus 

 M. Edw. , which inhabits the Atlantic and the Indian Oceans ; 

 it appears to may be distinguished chiefly by the carapace 

 being more narrowed at its posterior half, and by the more 

 slender and longer dactylopodites of the ambulatory legs. 

 The typical specimens of this species however are no more 

 present in the Leyden Museum; some specimens which I 

 have found in that collection , and which bore the name 

 of Grapsus pusillus de Haan, having been collected even 

 at Japan according to the label , completely resemble 

 the specimens of N. minutus M. Edw. from the Atlantic 

 Ocean. How to explain this fact? The Leyden collection 

 is in the possessiorl of specimens of Nautil. minutus M. 

 Edw. from the Atlantic Ocean and from New-Guinea, 

 which present no differences at all. According to Mr. de 

 Haan Nautilogr. pusillus de H. is also found in Mexico. 



21. Gnathograpsus intermedins n. sp. 



Closely allied to Gnathograpsus Riedelii Alph. M. Edw., 

 this species presents also some resemblance to Gnathograpsus 

 pilipes Alph. M. Edw. 



Notes Irom tlie Leyden ]VIu.seviixi. 



