STALK-EYED CRUSTACEA 145 



margins are longer than the postero-lateral margins, and 

 are normally divided into four teeth or lobes, besides the 

 exterior orbital tooth, which is usually obsolete ; behind 

 the last antero-lateral tooth are occasionally one or two 

 smaller teeth on the postero-lateral margin ; the marginal 

 teeth are usually dentiform, not rounded. 



The superior margin of the orbits are marked with 

 two slight notches and fissures. The basal antennal joint 

 reaches the infero-lateral process of the front, or even 

 enters slightly within the interior orbital hiatus. The 

 external maxillipedes have the fourth joint truncated or 

 slightly notched at the distal extremity, and its antero- 

 internal angle is slightly emarginate or sinuated ; its 

 antero-external angle is often slightly produced. The 

 legs of the first pair, in the adult male, are moderately 

 developed ; the fourth joint (arm) is short and almost 

 invariably covered in a dorsal view by the antero-lateral 

 margins of the carapace; the fifth is toothed on the inner 

 margin ; palm not cristated above. Walking legs are 

 moderately developed, with the fourth to the sixth joint 

 slightly compressed, but not carinated or spinose ; last 

 joint styliform. 



The abdomen in the male is five-jointed ; the three 

 intermediate segments coalescent. 



Range. — Pacific and Atlantic Oceans ; in shallow 

 water. 



Subgenus I. Leptodius. 

 Subgenus II. Xanthodius. 



Synopsis of the Subgenera and the Species. 



I. Endostome without trace of longitudinal carinas. — 

 (Subgenus Leptodius?) 



A. The arm of the first pair of legs not visible on a 

 dorsal view. — {L . flo^Hdanus^ 



