STALK-EYED CRUSTACEA 217 



single curve to the insertion of the fifth joint. Exognath 

 not reduced to a stump. Walking legs slender. 

 Guatemala. 



23. Pseudothelphusa conradi. 



PseudothclpJinsa conradi . . . Nobili. 



Superior margin of front keeled. The fourth joint of the 

 external maxillipedes narrow, outer margin very oblique. 

 A tubercle on outer surface of hand at base of movable 

 finger, with movable finger of larger hand wide throughout 

 its length. 



Ecuador, Peru. 



24. Pseudothelphusa magna. 



Superior margin of front keeled. Orbit more than 

 twice the depth of the eye. A tubercle on outer surface 

 of hand at base of movable finger. The fourth joint of 

 the external maxillipedes broad, the external and antero- 

 external margin very arcuate. Exognath not reduced to a 

 stump. 



Costa Rica. 



25. Pseudothelphusa tuberculata. 



Superior margin of front keeled. Orbit less than twice 

 the depth of the eye. A tubercle on outer surface of 

 hand at base of movable finger. Fourth joint of external 

 maxillipedes broad ; the external and antero-external 

 margin very arcuate. Exognath not reduced to a 

 stump. 



Guatemala, Costa Eica. 



