STALK-EYED CRUSTACEA 441 



tooth, and two sharp teeth on the inner angle of the 

 orbital notch ; dorsal median ridge without teeth. On 

 the posterior part of the carapace a median and a trans- 

 verse nodulated ridge form a cross. The abdomen has a 

 spinous keel traversing the middle line, each segment being 

 armed with two strong teeth. The eye is an obtuse point. 

 Range. — West Indies. 



2. Pentacheles. 



Pentaclielcs . Spence Bate, A. Milne Edwards. 



All the legs are more or less perfectly chelate in both, 

 sexes. The eyes are immovably lodged in a notch in the 

 anterior dorsal surface of the carapace, and the anterior 

 portion projects beneath the antero-lateral angle of the 

 carapace, which is produced anteriorly to a level with 

 the central rostral tooth. Gills as in Polycheles. 



Range. — Atlantic and Pacific Oceans ; in deep water. 



Synopsis of the Species. 



A. A single rostral spine. 



a. The carapace is hairy, and contracted in front. — 

 {P. agassisii.) 



B. Two rostral spines. 



b. The lateral borders of the carapace have strong 

 spines. — (P. spinosus}) 



c. The lateral borders of the carapace are finely 

 denticulated. — {P. validus.) 



I. Pentacheles agassizii. 



Pe7itacJieles agassizii . A. Milne Edwards. 



The carapace is hairy and contracted in front ; the 

 lateral edges are parallel in a great part of their extent ; 



