A XEAV CKAB FROM THE EOCENE OF FLORIDA 



By ]\1ai{y fJ. IIatiibun 



.l.s•^■or•/«^• in Zoolof/if. Tutted Sfatcs \'<iil(>t\<iJ Mu^ictim 



The material here described was collected in part by the United 

 States Geological Survey many j^ears ago, and in greater numbers more 

 recently by the Florida State Geological Survey, which has presented 

 to the United States National Museum the specimen designated as 

 holotype. 



Family XANTHIDAE 



OCALINA, new genus 



Genotype. — Ocalhia foi'idana^ new species. 



Carapace broadly suboval. margin lobulate, surface rough. Front 

 broad, consisting of 4 lobes which are distinct from the tooth at the 

 inner angle of the orbit. Orbit in an almost vertical plane, subcircu- 

 lar, closed, the inner margin of the inner lower angle being closely 

 applied to the lower side of the inner upper angle. Basal article 

 of antenna remote from orbit terminating not directly below the 

 orbital tooth but below the sinus separating that tooth from the front 

 proper. Third and fourth segments of male abdomen fused. Chelae 

 resembling those of Cancel^; longitudinal rows of tubercles on 

 palm; fingers elongate. 



This genus is nearest to the Recent genus Carpi/iii.s Leach ' of 

 which one species, Carpilius coralliinis^^ a crab of large s'ze. is not 

 uncommon in the West Indies and the Bahamas. It differs from 

 Ocalhia in its narrower front without a median emargination, in the 

 absence of a distinct inner orbital tooth, in the inner oi'bital gap, 

 which though narrow is always well defined and occui)ied by the 

 antenna, in the smooth carapace and margins, and in the shorter 

 chelae witli swollen palms and short, stout fingers. In Palaeocar- 

 pU'ms A. Milne Edwards -' (Eocene) the basal article of the antenna 

 is long and reaches to the orbit, the carapace is smooth, nontuber- 

 culate. except on the lateral margins, and the fingers are short. 



1 In Desmarest. Diet. Sci. Xnt.. vol. 28. 1823, p. 228. 



= Ilurbst, Natur. Krabben u. Krebsc, vol. 1, 1783, p. 133, pi. 5, fig. 40. 



3 Ann. Sci. Nat., Zool., ser. 4, vol. 18, 1862, p. 51. 



No. 2786— Proceedings U. S. National Museum, Vol. 75, Art. 15. 



33429—29 1 



