STALK-EYED CRUSTACEA 87 



Epistome scarcely transverse. Basal joint of external 

 antennae with a long spine at its antero-external angle. 

 Fourth joint of the external maxillipedes produced at its 

 antero-external angle. First pair of legs of moderate size ; 

 palm rather slender, compressed. 



I. Mithrax (Nemausa) rostrata. 



Neniaiisa rostrata .... A. Milne Edwards. 

 MitJirax rostrata .... Miers. 



The carapace is smooth ; it has some tubercles slightly 

 marked on the gastric region, better marked on the car- 

 diac region, and spiniform on the branchial regions. The 

 lateral edges have sharp spines ; the first is formed by the 

 external orbital angle ; the second is in the hepatic region ; 

 the branchial regions have spines weaker and more 

 irregular in their size. The praeocular spine is short. The 

 rostral horns are pointed. The basal joint of the external 

 antenna; is wide, and slightly exceeds the frontral border ; 

 it has in front a pointed spine ; a second spine, less strong, 

 is placed on its external edge below the first. 



The first pair of legs of the male is short ; the hand 

 is smooth. The forearm and the arm have above some 

 pointed tubercles. The fourth and fifth joint of the walk- 

 ing legs have spines on their superior border. 



Range. — Montserrat, Martinique, Grenadines, Ber- 

 muda, Gulf of Mexico. 



Subgenus Mithrax. 



MitJirax Miers. 



Mithraculus White. 



TclcopJirys Stimpson. 



Carapace very broad, and depressed, usually transverse. 

 Spines of rostrum very short or obsolete. Basal joint of 



