66 STALK-EYED CRUSTACEA 



and knobby above. The anterior angle of the superior 

 orbital border is prolonged in front in the form of a large 

 round tubercle. The rostrum is very large and armed in 

 front with two teeth directed outwards. The second 

 joint of the external antenna; is thin, cylindrical, and 

 twice as long as the third. Legs of the first pair small 

 and tuberculated ; those of the second pair not so long as 

 the carapace. Legs have hairs in bunches. 



Colour, intense red. 



Range. — West Indian Sea, Mediterranean Sea. 



4. Sphenocarcinus. 



SpJienocarcinus ... A. Milne Edwards. 



The carapace subpentagonal, wide behind, tapering in 

 front. There is no praeocular spine. Rostrum elongated, 

 its spines contiguous to within a very short distance of their 

 extremities, which are acute. The basal joint of external 

 antennre straight, and the flagellum is inserted under the 

 rostrum, which hides it completely. The epistome is 

 straight and long. The fourth joint of the external 

 ma^illipedes is slightly dilated at its antero-external 

 angle, and is slightly notched at its inner angle for the 

 insertion of the next joint. 



The legs of the first pair are small and symmetrical. 

 The first pair of the walking legs is the longest. 



Range. — West Indies. 



I. Sphenocarcinus corrosus. 



Sphenocarcinus corrosus . A. Milne Edwards. 



The body and legs are free of hairs ; the carapace is 

 depressed, and the different regions are formed of pro- 

 jections resembling islands separated by wide spaces, 



