DECAPOD CRUSTACEANS OF THE WEST INDIES 207 



How sand is brought to near the siu'face was not observed, but 

 frequent observations were made of sand being thrust out of the 

 mouths of burrows with such force that it traveled three or four feet 

 down the beach. 



The discovery of a very small juvenile of Ocypode in a tributary 

 of the Layou River near Clarke Hall can only be regarded as unusual; 

 it seems very unlikely that it could have wandered that far from the 

 coast independently. 



Distribution. — Rhode Island to Estado de Santa Catarina, 

 Brazil (Bermudas, Eleuthera I., New Providence I., Green Cay, San 

 Salvador I., Cuba, Jamaica, Hispaniola, Isla Mona, Puerto Rico, 

 Saint Thomas, Saint Croix, Dominica, Saint Lucia I., Barbados, Isla 

 de Margarita, Islas de Los Roques, Aruba, Isla de Providencia, 

 Swan Is.). 



Dominica Stations: 1, 6, 36, 57, 67, 97, 102, 104, 107 (0-5 ft.). 



Genus Uca 



84. Uca burgersi Holthuis 



Figures 70, 7la-d 



Gelasimus affinis Streets, 1872, p. 131 [type-locality: Saint Martin; not Gelasimus 



affinis Gu^rin-Mfoeville, 1829]. 

 Uca affinis. — Holthuis, 1959, pp. 265, 266. 

 Uca burgersi Holthuis, 1967, p. 51 [type-locality: coconut grove on southwest 



coast of Curagao]. 



Diagnosis. — Carapace very roughly trapezoidal, almost hexagonal, 

 slightly more than two-thirds as long as wide, strongly convex but not 

 semicylindrical longitudinally, surface smooth but slightly uneven 

 with few isolated stiff setae anterolaterally; fronto-orbital distance 

 nearly or quite representing maximum carapace width; front widening 

 toward base, not subspatulate, width between posterodistal angles of 

 basal segments of eyestalks, with eyes retracted, distinctly more than 

 one- third of fronto-orbital distance; lateral marginal ridges curving 

 regularly into strongly convergent, sinuous posterior portions. Cornea 

 moderately swollen, occupying about two-fifths of extensor surface of 

 distal segment of eyestalk. Chelipeds greatly dissimilar and unequal 

 in males, small and subequal in females; fingers of major chela of male 

 distinctly longer than pahn, slender, widely gaping, not unusually 

 compressed. Second, third, and fourth pereiopods pubescent on ex- 

 tensor margins of carpus and propodus in both sexes. Hair-fringed 

 ventral opening present between coxae of third and fourth pereiopods. 

 Denuded first pleopod of male terminating, in posterior view, in trun- 

 cate tip directed somewhat laterally, lateral lobe much the wider (fig. 

 716). A rather smaU species, maximum carapace length in midline 

 about 15 mm. 



