44 Bulletin, Vanderhilt Marine Museum, Vol. II 



distal end crenulated, fitting closely upon the lower ; the entire cutting 

 edge of both fingers is dentate. The lower finger is shorter than the 

 upper. 



The first and second ambulatories are long, laterally flattened, ex- 

 cept the dactyl, which is conical, very curved, with a long, sharp tip. 



The third and fourth ambulatories are shorter, subdorsal in position, 

 reflexed upon the back, the fourth pair lying directly upon the pos- 

 terior part of the carapace; the fifth pair shorter, below and behind 

 it. The dactyl of the fourth leg is curiously long and curved forward 

 and has on its outer lateral margin near the base a small, outpointing, 

 curved spine. The long spine interfits between two shorter, acute, 

 curved spines, which pair arise from the anterolateral angle of the 

 dactyl and are directed posteriorly. The dactyli of the fourth legs are 

 similar to those of the third pair in structure, except that the long 

 dactyl tip lacks the accessory basal spine and is directed posteriorly, 

 while the paired, shorter spines between which it locks are directed 

 forwards. 



The entire animal is densely covered with stiff, short, upstanding, 

 multispinose setae. 



This crab affords an excellent study of the primitive structure of 

 antennae and antennulae in relation to the orbit and mouth cavity. 



Synonymy: Dromidia antillensis Stimpson, Proc. Acad. Nat. Sci. 

 Phila., p. 225, 1858.— Ann. Lye. Nat. Hist. N. Y., vol. 7, p. 71, 

 1859. — S. I. Smith, Trans. Conn. Acad. Arts and Sci., vol. 2, p. 

 17, 1869 (gives detailed measurements). Benedict, Bull. U. S. 

 Fish. Comm., vol. 20, pt. 2, p. 132, 1901. — Verrill, Trans. Conn. 

 Acad. Arts and Sci., vol. 13, p. 431, fig. 51, pi. 28, figs. 2 

 and 3, 1908. — Rathbun, Ann. Inst. Jamaica, vol. 1, art. 1, p. 39, 

 1897. — Rathbun, Rapport betreffende een vooloopiz onderzoek 

 naar den toestand van de visscherij en de Industrie van zeepro- 

 ducten in de Kolonie Curagao, vol. 1, p. 331, 1907. — Rathbun, 

 Univ. Iowa Studies Nat. Hist., vol. 9, No. 5, p. 66, 1921. — Hay and 

 Shore, Bull. U. S. Bur. Fish., vol. 35, p. 417, 1918.— Boone, BuU. 

 Bingham Oceanog. Coll., vol. 1, art. 2, p. 48, fig. 10, 1927 (gives 

 description of megalops and figures of same). 



