DECAPOD CRUSTACEANS OF THE WEST INDIES 183 



flattened, inerus of third pereiopod distinctly more than half as wide 

 as long, with sharp siibdistal tooth on extensor margin; dactyl about 

 as long as extensor margin of propodus. Denuded first pleopod of 

 male terminating, in posterior view, in flared proximolaterally rounded 

 distomesially straight endpiece directed distolaterally (fig Q2j). A 

 medium-sized species, maximum carapace length in midhne about 

 27 mm. 



Habitat. — Burrows in muddy banks of rivers and ditches. 



Distribution. — Tobago and Trinidad to Estado de Sao Paulo, 

 Brazil. 



72, Sesarma {Holometopus) ricordi H. Milne Edwards 



Figure 62/1; 



Sesarma Ricordi H. Milne Edwards, 1853, p. 183 [type-locality: Haiti]. 

 Sesarma Guerini H. Milne Edwards, 1853, p. 183 [type-locality: unknown]. 

 Sesarma miniata De Saussure, 1858, p. 442 [typo-locality: Saint Thomas]. 

 Sesarma (Holometopus) ricordi. — Rathbun, 1897a, p. 91; 1918, p. 308, pi. 89. — 



Holthuis, 1959, p. 246, pi. 11: fig. 3.— Hartnoll, 1965, pp. 113, 115, 131-134, 



144, 146, figs. 10a, 11a, c, 12, table 7. 



Diagnosis.— Carapace subquadrate, nearly as long in midline as 

 wide, moderately convex longitudinally and transversely, sparsely 

 striate laterally, smooth elsewhere; lateral margins slightly sinuous, 

 nearly subparallel, without tooth posterior to outer orbital angle, 

 fronto-orbital distance very nearly equaling maximum width of 

 carapace; front abruptly deflexed at postfrontal lobes, broadening 

 distally, more than half as wide as carapace, margin shallowly bilobed 

 in dorsal view. Eyes well developed, cornea wider than eyestalk. True 

 ventral margin of orbit largely replaced by slightly sinuous granulate 

 ridge accentuated posteriorly by well-defined groove, mesial end of 

 ridge not reaching anterolateral angle of mouth area. Third maxilli- 

 peds with oblique liauy ridge on merus, gaping widely, exposing 

 mandibles. Chelipeds subequal, carpus produced into shallow dentic- 

 ulate lobe on flexor margin; palm with few obscure oblique granulate 

 dorsal striae; fingers pointed, narrowly spoon tipped, extensor surface 

 of movable finger nearly smooth. Walking legs flattened, long and 

 slender, merus of third pereiopod about one-third as wide as long, 

 with sharp subdistal tooth on extensor margin; dactyl about as long 

 as extensor margin of propodus. Denuded first pleopod of male ter- 

 minating, in posterior view, in short bluntly triangular endpiece 

 skewed slightly lateraUy (fig. Q2k). A medium-sized species, maximum 

 carapace length in midline slightly more than 20 mm. 



Habitat. — Among rocks and debris along tide line and up to 50 

 yards inland. 



