STALK-EYED CRUSTACEA 419 



the form of a needle, exceeding slightly the ocular 

 peduncles. 



The legs of the first pair are about five times the 

 length of the carapace ; they are cylindrical and covered 

 with small serrated spines, directed forwards, arranged 

 longitudinally. There are some scattered hairs. The 

 fingers are frail, long, with very fine and pointed denti- 

 culations. The succeeding legs are very large, feeble, and 

 spinous. The second pair is the most developed, and 

 extend to the joint of the pincers. 



The abdomen is wide and smooth. 



The sternal plastron has a deep median groove. 



Range. — Barbados, Grenadines, St. Lucia, Guada- 

 loupe, Cariacou. 



7. Uroptychus. 



Uroptychus . Henderson. 



DiptycJius . . A. Milne Edwards, A. Milne Edwards 

 and Bouvier. 



Rostrum flattened and acute. Carapace somewhat 

 ovate in shape, with its surface glabrous and usually 

 devoid of spines. First pair of legs elongated and of 

 varying width ; walking legs slender. Eye-stalks short 

 and stout ; cornea scarcely dilated. Antennal peduncle 

 slender, the first free joint provided with a flattened and 

 acute acicle or movable spine ; the flagellum never of 

 great length, and in some cases remarkably short. 

 External maxillipedes comparatively smooth, with the 

 terminal joints elongated, more especially the last joint 

 but one, which is considerably longer than any of the 

 other joints. Abdomen smooth and glabrous externally ; 

 the telson (which is transversely segmented and of small 

 size), as well as the last pair of appendages, bent under 



