STALK-EYED CRUSTACEA 45 



completely retractile. Pr?eocular spine short or absent ; 

 postocular spine or lobe largely developed. Basal joint 

 of external antennae considerably enlarged throughout 

 its length. The fourth joint of the external maxillipedes 

 truncated distally. Legs usually rather slender. 

 Abdomen six to seven-jointed in both sexes. 



I. Esopus. 



Esopus ... A. Milne Edwards. 



The body and legs are almost completely glabrous. 

 The carapace is thick, gibbous, and as it were bloated 

 elongato-oval. The front is formed of a large projecting 

 round tubercle. The orbits arc incomplete below, and 

 the superior orbital margin is cut by a large fissure. 

 The ocular peduncles are large, and can be retracted 

 into a fossa. The basal joint of the external antennae 

 reaches almost to the front. The buccal cavity is wide 

 in front. The fourth joint of the external maxillipedes 

 is a little dilated outwards and anteriorly, and has not 

 a notch inside for the articulation with the next joint. 



The walking legs are very thin, very long, and 

 terminate in very delicate tips. The abdomen of the 

 female is broad, curved, and formed of three segments, 

 the third, fourth, fifth, sixth and seventh being soldered 

 together. Of small size. 



Range. — West Indian Sea ; in deep water. 



I. Esopus crassus. 



Esopus crassus ... A. Milne Edwards. 



The carapace is slightly contracted in front ; it is 

 completely covered with shining granulations. Anteriorly 

 it is much swollen. The interorbital space is divided 



