STALK-EYED CRUSTACEA 95 



in front. The antero-lateral edges are cut into four round 

 lobes, which in the young are pointed. The front is wide, 

 a Httle advanced, formed of two small tubercles separated 

 by a notch. The basal joint of external antennae is very 

 dilated on the outside, where it forms a part of the iloor 

 of the orbit and of the inferior orbital border ; its antero- 

 external angle has a tubercle and is scarcely more advanced 

 than the superior and internal orbital angle. Fourth joint 

 of external maxillipedes is not notched anteriorly and 

 internally. The first pair of legs of the male has the 

 hand smooth, laterally compressed ; the fingers are well 

 developed, their extremity not toothed. The fixed 

 finger has on its cutting border, about the middle, one 

 strong tooth. The forearm is smooth ; the arm has in 

 front two spiniform tubercles. The walking legs are 

 hairy and have a few spines. 



Range. — Barbados, Guadaloupe, Martinique, St. 

 Thomas, Florida. 



12. Mithrax (Mithrax) cinctimanus. 



Mithraculus cinctimanns . A. Milne Edwards, Stimp- 



son. 

 Mithrax affinis .... Desbonne and Schramm. 



The carapace is covered, especially behind and later- 

 ally, with nodosities. The antero-lateral borders are a 

 little oblique and obscurely cut into four small teeth or 

 tubercular eminences, more pointed when the specimens 

 are young. The external orbital angle is sharp. The 

 rostral horns are small, but advanced, and exceed the 

 praiocular angles and the spine on the basal joint of the 

 external antennae. The pincers are slightly swollen. The 

 hand is smooth, with one tooth on movable finger. The 

 forearm is smooth in young specimens, with tubercles on 



