STALK-EYED CRUSTACEA 431 



on the margin in front of the deep lateral notch. The 

 external antennae are wider than long, with their margin 

 cut into sharp teeth ; the first joint is toothed anteriorly. 

 There is no spine upon the base of the posterior legs, 

 and their third joints are grooved on the under side. The 

 colour is yellow-brown, each tooth having a purple tip, 

 with a light purple spot. 



Range. — West Indies, Barbados. 



2. Scyllarus. 



Scyllarns . Fabricius, Latreille, Lamarck, Leach, 



Desmarest, H. jNIilne Edwards. 

 Cancer . . Linne, Herbst. 



The carapace is longer than wide, with the lateral 

 edges parallel. The orbits are situated at some distance 

 from the middle line near the external angles of the 

 carapace. They are circular, and are directed upwards. 

 The sternum is of moderate size. The abdomen is 

 very thick, and is longer than the anterior portion of 

 the body. 



The external antennse are close together ; the gills are 

 twenty-one in number, and there is an external appendage 

 to the external maxillipedes. 



Range. — Atlantic Ocean, West Indies, Mediterranean 

 Sea. 



Synopsis of the Species. 



A. The tubercles on the surface of the carapace are 

 fringed with hairs. The third and fourth joint of the legs 

 are cut into grooves. — (6". sqttainosus^ 



B. The tubercles on the surface of the carapace are 

 scarcely hairy. The third and fourth joint of the legs are 

 not cut into grooves. — {S. cequiiioxialis.) 



