648 



PROCEEDINGS OF THE NATIONAL MUSEUM. 



VOL. 50. 



posterior part of the cardiac region there is a tubercle in tuherosa 

 and antUlens^ls, but not in semilevis. The carapace depressions are 

 everywhere deeply eroded in antiUensls, more so than the elevations ; 

 the depressions in tuherosa are only in part eroded, largely closely 

 punctate; all the depressions in semilevis are smooth to the naked 

 eye, but microscopically punctate. Frontal lobes of antlllensls 

 more advanced than in tuherosa and semilevis. Antero-lateral mar- 

 gin thicker in antillensis than in tuherosa or semilevis. Postero- 

 lateral teeth of tuherosa triangular, the first or lateral tooth pro- 

 jecting sideways beyond the antero-lateral margin, the last tooth 

 rectangular, subacute, larger than the two preceding; the postero- 

 lateral prominences in antillensis and semilevis are rounded lobes; 

 in antillensis, the first or lateral lobe does not project sideways be- 

 yond the antero-lateral margin, the last lobe is very little longer 

 (from apex to base) than the third lobe, and the third lobe very 

 little longer than the second; in semilevis the first or lateral lobe is 

 produced sideways equally with the adjacent antero-lateral tooth, 

 the last lobe is longer (from apex to base) than the others and is 

 wider than the third lobe and narrower than the second lobe. The 

 abdomen of tuherosa and antillensis is deeply eroded all over, that 

 of semilevis is moderately eroded along the sides and on the last two 

 segments. The manus of tuherosa has the proximal tooth on the 

 upper margin bifid ; in antilleiisis the proximal tooth is tridentulate ; 

 in semilevis all the teeth are simple and entire. The fixed finger in 

 semilevis is shorter and the dactylus more deflexed than in tuherosa 

 and antillensis. Dactyli of tuherosa and antillensis covered with a 

 short, dense, feltlike pubescence, which is absent in semilevis. 



MEASUREMENTS. 



Holotype. 



