86 STALK-EYED CRUSTACEA 



c^. Three blunt spines on basal joint of external 

 antenna.'. 



8. Carapace smooth. — (M. lavivianus?) 



g. Carapace with flat granulations. — (M. verrncosus^ 



ii^. A prominent spine between internal antenna?. 



10. Carapace has no spines on lateral and posterior 

 angles. — {M. lettconielas.') 



B. Carapace very much depressed, with smooth, shallow 

 sulci between the tubercles of the dorsal surface of the 

 branchial regions. Lateral margins tuberculated. 



c. Antero-lateral edge of carapace cut into four or five 

 tubercles, not counting postocular spine. 



1 1. No teeth on extremities of pincers ; one large tooth 

 in centre of fixed finger. — {M. sculptiis.) 



12. Movable finger has one large tooth. — {M. cincti- 

 manus.) 



13. Fingers large and wide at extremity; one large 

 tooth in middle of each finger. — {M. forceps.) 



d. Antero-lateral margin of carapace has four 

 tubercles, second and third the largest. 



14. The movable finger has one large tooth. The 

 fixed finger has fine teeth only at extremity. — {^M. midi(s.) 



e. Antero-lateral margin of carapace has three lobes. 



15. Last tubercle is sharp and curved forward. — {M. 

 ruber.) 



16. Fixed finger has teeth only at extremity. — {M. 

 coro7iatits^ 



Subgenus Nemausa. 



Nemaiisa A. Milne Edwards. 



. Nemaiisa (subgenus) . . . Miers. 



Carapace subpyriform, much longer than broad. 

 Spines of rostrum well developed, slender, acute. 



