STALK-EYED CRUSTACEA 407 



c^. Eye-stalks produced into two slender lateral spines. 

 — {M. nitida.) 



d'^. Eye-stalks produced into one long spine. — {AT. 

 spinoculata^ 



d. Spines on dorsum of abdomen. 



d^. Second, third, and fourth abdominal segment have 

 a median spine directed forwards. — (J-/, abbreviata.) 



e^. Second and third abdominal segment have a 

 median spine and lateral spines. — {M. sen-atifrojis.) 



f^. Second, third, and fourth abdominal segment have 

 a median keel terminating in front in a spine. — {M. 

 7'objista.) 



C. Rostrum composed of three spines. 



e. Second and third segment of abdomen have four 

 or six spines arranged transversely, these are slightly 

 marked on fourth segment. — {M. erinacea.) 



f. Second and third abdominal segment have three 

 spines ; the fourth has none. — {M. spinifer.) 



g. The abdomen is smooth. 



g^. Carapace has no spines on dorsum. — {M. lati- 

 frons.) 



JiS, Carapace has two spines on gastric region. — {M. 

 Widens^ 



A. Rostrum a single spine: — 



I. Munidopsis sigsbei. 



Mnnidopsis sigsbei . . A. Milne Edwards, Hender- 

 son, A. Milne Edwards and 

 Bouvier. 



Galathodcs sigsbei . . A. Milne Edwards. 



The carapace has no spines and no ridges arranged 

 transversely ; it is much curved from side to side. The 



