144 I.F.AXr.KR N.\TATOr<. 



Leander imtator M. Edw. therefore lias an extraordina- 

 rily wide geographical range , being recorded from the 

 Sargasso-sea (Atlantic Oceau), the Mediterranean , Indian 

 Ocean , Waigeoei (Moluccas) and Japanese seas. It has an 

 equally large distribution as many other pelagic species , 

 as for instance Nmttilograpsus Tninutus M. Edw. 



According to Mr. S. I. Smith (The Stalk-eyed Crust. 

 Atlant. Coast N. America, pag. 122) Leander natator is 

 identical with Say's Palaemon tenuicornis : in that case 

 our form should be called Leander tenuicornis Kingsley. 



Leyden, May 1881. 



