STALK-EYED CRUSTACEA 125 



4. Actaea. 



Actaa . . De Haan, Dana, A. Milne Edwards, Miers. 

 Cancer . Linne, Fabricius, Latreille, Desmarest, 



H. Milne Edwards. 

 Zosyniits . H. Milne Edwards. 

 Xaiitho . Rappell, A. Milne Edwards, Lucas. 

 Actodcs . Dana. 



Carapace transverse and slightly convex ; lobes well 

 marked, granular ; front with two or four lobes ; antero- 

 lateral margins have round lobes, which may not be well 

 marked. Orbits are small, and may have closed fissures. 

 The eyes are on short stalks. The basal antennal joint 

 reaches the infero-lateral process of the front ; the flagellum 

 lies within the interior orbital hiatus. The fourth joint of 

 the external maxillipedes is quadrate, distally truncated, 

 and slightly emarginate at the antero-internal angle. The 

 legs of the first pair are subequal and of moderate size ; 

 fifth joint and palm usually granulated. The walking 

 legs are of moderate length ; usually compressed, not dis- 

 tally carinated ; superior margin of fourth joint is some- 

 times acute. 



The abdomen in the male is five to seven-jointed. 



Range. — Australia, Cape, Red Sea, West Indies 



Synopsis of the Species. 



A. The front has four lobes. 



a. The antero-lateral border has four lobes. — {A, 

 setigera.) 



B. The front has two lobes. 



b. The general surface is spin)'. — {A. acaiitha.) 



c. The general surface is tubercular. — i^A. ?iodosa.) 



