DECAPOD CRUSTACEANS OF THE WEST INDIES 163 



Here, it was exceedingly difficult for a person even to crawl, and there 

 was little chance of overtaking a swiftly running crab. Clumps of the 

 fern, Acrostichum daneaefolium, also provided refuges for this crab. In 

 and along this marsh there are numerous burrows of fiddler crabs and 

 of Cardisoma guanhmni and Ucides cordatus. 



While Goniopsis was observed only at these two localities, it should 

 occur in most of the low swampy areas immediately adjacent to the 

 coast; however, it seems improbable that it is very common anywhere 

 except in the area around the large Portsmouth marsh; otherwise, it 

 would have at least been seen more frequently. 



Distribution. — Bermudas to Estado de Sao Paulo, Brazil (Ber- 

 mudas, Eleuthera I., New Providence I., Cuba, Jamaica, Hispaniola, 

 Puerto Rico, Saint Thomas, Saint Croix, Dominica, Barbados, Islas 

 Los Roques, Curagao, Isla de Providencia) ; eastern Atlantic from 

 Senegal to northern Angola. 



Dominica Stations: 38, 112 (0-5 ft.). 



Genus Grapsus 



59. Grapsus grapsus (Linnaeus) 



Figures 50, 52g-i 



Cancer Grapsus Linnaeus, 1758, p. 630 [type-localities: America and Ascension 



Island]. 

 Grapsus pictus Lamarck, 1801, p. 150 [type-localitj'?]. 

 Grapsus (Goniopsis) pictus. — De Haan, 1835, p. 33. 

 Grapsus maculatus H. Milne Edwards, 1853, p. 167, pi. 6: figs. 1-ln [type-locality: 



Antilles]. 

 Grapsus Webbi H. Milne Edwards, 1853, p. 167 [Type-locality: Canary Islands]. 

 Grapsus ornalus H. Milne Edwards, 1853, p. 168 [Type-locality: Chile]. 

 Grapsus altifrons Stimpson, 1860, p. 230 [type-locaUty: Cabo San Lucas, Estado 



de Baja California, Mexico]. 

 Grapsus grapsus. — Ives, 1891, p. 190. — Rathbun, 1918, p. 227, pis. 53, 54. — 



Monod, 1956, p. 407, fig. 561. 

 Grapsus Kingsleyi De Man, 1900, p. 46, pi. 2: fig. 8 [type-locality: Lobito, 



Angola]. 

 Cancer jumpibus Swire, 1938, p. 30 [type-locality: Saint Thomas]. — Holthuis, 



1960, p. 373. 



Diagnosis. — Carapace nearly subcircular in adults, more than 

 nine-tenths as long as broad, moderately convex but depressed on 

 hepatic and posterior mesogastric regions, striations distinct laterally, 

 especially on branchial region, anterior gastric regions tuberculate; 

 lateral margins convergmg both anteriorly and posteriorly with acute 

 tooth posterior to outer orbital angle, fronto-orbital distance less than 

 three-fourths of maximum width of carapace in adults; front sharply 

 deflexed at postfrontal lobes, less than two-fifths as wide as carapace, 

 margin slightly convex in dorsal view. Eyes well developed, cornea 



