420 STALK-EYED CRUSTACEA 



the preceding segments and applied to the thoracic 

 sterna ; males with the first two pairs of appendages 

 (copulatory organs) fairly well developed, those of the 

 third and fourth segment rudimentary, those of the fifth 

 absent ; females with two pairs of ovigerous appendages 

 on the third and fourth segment, those of the other 

 segments (with the exception of the penultimate) absent. 

 Eggs few and of large size. 



Range. — Moderately deep and deep seas. 



Synopsis of the Species. 



A. Dorsal surface of carapace smooth. 



a. No spines on lateral edges of carapace except at 

 antero-lateral angle. 



a^. Rostrum twice as long as eye. — (il. m'tu/us.) 

 b^. Rostrum about as long as eye. — ( U. juicifer) 



B. Dorsal surface of carapace (and rostrum) covered 

 with small spine-like tubercles. — {U. ritgosns.) 



I. Uroptychus nitidus. 



Uroptychus nitidus . Henderson. 

 Diptychus nitidus . . A. Milne Edwards, A. Milne 



Edwards and Bouvier. 



The carapace is smooth, shining, without spines 

 (except at each antero-lateral angle) or transverse strias ; 

 it is transversely curved, almost flat from before back- 

 wards, and straighter in front than behind. The regions 

 are scarcely marked. The rostrum is spiniform and 

 flattened above ; it is about twice as long as the eyes. 

 The lateral edges are unarmed. 



The legs of the first pair are very long, smooth, and 

 shining. The fourth joint is very frail at its base. The 

 fifth is longer than the fourth, slightly compressed 



