STALK-EYED CRUSTACEA 229 



external maxillipedes ridged, and strongly produced at 

 its anterior angle. 



The first pair of legs of the female unequal, punctate ; 

 fourth joint triangular, upper margin acute, with a tooth 

 at the distal end ; lower surface with a small sharp spine 

 on the outer and the inner margin, and a blunt projection 

 at the extremity of the outer margin ; the fifth joint with 

 a spine on the inner margin. Hands convex beneath, 

 almost straight above ; fingers in contact in both hands 

 when closed. Walking legs very slender ; fourth joint 

 not dilated. Walking legs, fingers, and upper portion of 

 hand and wrist covered with a close velvety down. 



The abdomen of the female covering the sternum ; 

 last segment broadly triangular, rounded at the tip. 



Range. — Nicaragua, found in an almost dry ditch 

 near the Escondido River. 



2. Trichodactylus dentatus. 



Trichodactylus dentatus . H. Milne Edwards, 



The front of the carapace is feebly bilobed. Orbits 

 small. The regions of the carapace well marked. The 

 lateral borders of the carapace are armed with four teeth 

 placed at some distance behind the external orbital 

 angle. 



Range. — Brazil. 



3. Trichodactylus quadratus. 



Trichodactylus quadratus . H. Milne Edwards. 

 Trichodactylus fluviatilis . Latreille. 



The carapace is smooth, with its lateral border slightly 

 raised, without any teeth. 

 Range.— Brazil. 



