STALK-EYED CRUSTACEA 487 



almost smooth. The rostrum has eleven teeth above and 

 four below. 



Range. — Guiana, Brazil. 



5. Bithynis nattereri. 



Palcsmon nattereri . Heller, Miers, Von Martens. 



The second pair of legs long, strong, closely spinulose, 

 and of unequal length ; the palm is longer than the fifth 

 joint; the movable finger has two and the fixed finger 

 has one strong tooth on the inner margin. The sides 

 of the carapace are rough below the hepatic spine. The 

 rostrum has eleven teeth above and four below. 



Range. — Guiana, Rio Negro, Brazil. 



B. Fifth Joint of largest leg longer tJian palm : — 



6. Bithynis lamarrei. 



Palenwn lamarrei . . . H. Milne Edwards. 



Rostrum large, longer than the basal scale of the 

 external antennae, turned up, armed above with six or 

 seven teeth which are placed upon the posterior two- 

 thirds, and below with six or seven small teeth. Legs of 

 the second pair filiform in their entire length ; hand very 

 short and scarcely swollen ; fifth joint about twice as long 

 as the hand. Last abdominal segment has three spines. 

 Range. — Indian Ocean. 



7. Bithynis forceps. 



Bithynis forceps . . , Kingsley. 

 Palemon forceps . . . H. Milne Edwards, Saussure, 



Smith. 



Body thickset. Rostrum straight, as long as the 

 basal scale of the external antennae ; eight to ten teeth 



