182 U.S. NATIONAL MUSEUM BULLETIN 29 2 



material of this species but without success. For further notes on this 

 area see ecological discussions of Goniopsis cruentata and of Uca 

 burger si. 



Distribution. — Bahamas to Uruguay (Great Abaco I., Eleuthera 

 I., San Salvador I., Cuba, Isla de Pinos, Dominica, Swan Is.). 



Dominica Station: 112 (0-5 ft.). 



Remarks. — Inasmuch as the single specimen collected during the 

 Dominican Survey is immature, the identification is slightly doubtful. 

 The first pleopod is not fuUy developed, but it bears a closer resem- 

 blance to the first pleopod of Sesarma miersii than it does to any other 

 West Indian species of the genus. 



As shown in figures Q2g and &2k, the male pleopods of iS. miersii and 

 S. ricordi are quite different. Hartnoll (1965, p. 133) is apparently 

 correct, however, in believing that S. miersii does not normally occur 

 on Jamaica. Examination of the pair of dried specimens (USNM 

 41525) identified as that species by Rathbun discloses that they are 

 typical S. roberti. 



71. Sesarma {Holometopus) rectum Randall 



Figure 62j 



Sesarma recta Randall, 1840, p. 123 [type-locality: Surinam]. 



Sesarma mullerii A. Milne-Edwards, 1869, p. 29 [type-locality: Florian6polis, 



Brazil]. 

 Sesarma (Holometopus) recta. — Tesch, 1917, p. 190. 

 Sesarma (Holometopus) rectum. — Rathbun, 1918, p. 298, pi. 82. — Holthuis, 1959, 



p. 243, text-fig. CI, pi. 11: fig. 4. 



Diagnosis. — Carapace broadly subquadrate, between four-fifths 

 and nine-tenths as long in midline as wide, moderately convex longi- 

 tudinally and transversely, striate laterally, obscurely granulate and 

 sparsely setose elsewhere; lateral margins sinuous, converging slightly 

 posteriorly, without tooth but with \Qry slight emargination posterior 

 to outer orbital angle, fronto-orbital distance nearly equaling maximum 

 w^dth of carapace; front abruptly defiexed at rounded postfrontal 

 lobes, nearly three-fifths as wide as carapace, margin with broad deep 

 median sinus in dorsal view. Eyes well developed, cornea slightly 

 wider than eyestalk. True ventral margin of orbit largely replaced by 

 sinuous granulate ridge accentuated posteriorly by deep groove, 

 mesial end of ridge not curving to anterolateral angle of mouth area. 

 Third maxillipeds with oblique hairy ridge on merus, gaping widely, 

 exposing mandibles. Chelipeds subequal, carpus armed with sharp 

 tooth on flexor margin; palm, with rather sharp faintly tubercidate 

 dorsal ridge or carina extending over entire length; fingers narrowly 

 spoon tipped, movable finger armed with 14-16 acute tubercles over 

 nearly entire length of extensor margin. Walking legs very broadly 



