DECAPOD CRUSTACEANS OF THE WEST INDIES 81 



Basal segment of antennular peduncle without dorsal spines. First 

 four pereiopods with well-developed exopods, that on fifth reduced to 

 barely discernible bud. Fingers of chelae of first and second pereiopods 

 bearing terminal tufts of long hair. Carpus of second pereiopod much 

 longer than broad. Last three pereiopods without horny scales or 

 tubercles. Merus of thu"d pereiopod not noticeably broader than that 

 of fourth. A small species, maximum postorbital carapace length about 

 5 mm. 



Habitat. — Subterranean fresh water. 



Distribution. — Isla Mona; Barbuda. 



Remarks. — Specimens collected in Dark Cave on Barbuda dm-ing 

 the Smithsonian-Bredin Expeditions of both 1958 and 1959 appear to 

 be indistinguishable from the type-series from Isla Mona. 



Genus Xiphocaris 



16. Xiphocaris elongata (Guerin-Meneville) 



Figures 17, 18, 19e, / 



Hippolyte elongatus Gu6rin-M6neville, 1855, pi. 2: figs. 16, 16a [type-locality: 



Havana, Cuba]. 

 Opiophorus americanus De Saussure, 1858, p. 472, pi. 4: figs. 31-31b [type-locality: 



mouths of rivers of Republic of Haiti]. 

 Xiphocaris elongata. — Von Martens, 1872, p. 140. — Pocock, 1889, p. 17, pi. 2: 



fig. 8.— Bouvier, 1925, pp. 9-20, 48-54, figs. 1-53.— Hart, 1961b, p. 76, 



figs. 18-19. 

 Xiphocaris gladiator Pocock, 1889, p. 18, pi. 2: fig. 6 [type-locality: Layou River, 



Dominica]. 

 Xiphocaris gladiator, var. intermedia Pocock, 1889, p. 19, pi. 2: fig. 7 [type-locality: 



Layou River, Dominica]. 

 Xiphocaris brevirostris Pocock, 1889, p. 20, pi. 2: figs. 5, 5a [type-locality: 



Dominica]. 

 Opiophorus elongatus. — Sharp, 1893, p. 121. 

 Xiphocaris elongata typica. — Ortmann, 1894, p. 400. 

 Xiphocaris elongata intermedia. — Ortmann, 1894, p. 400. 

 Xiphocaris elongata gladiator. — Ortmann, 1894, p. 400. 

 Xiphocaris elongata brevirostris. — Ortmann, 1894, p. 400. 



Diagnosis. — Orbital margin unarmed. Rostrum armed with series 

 of subequal, close-set, small teeth in basal part of dorsal margin, 

 ventral margin finely serrate. Ventral margins of abdominal pleura 

 unarmed. Eyes well developed. Basal segment of antennular peduncle 

 without dorsal spines. All pereiopods mth well-developed exopods. 

 Fingers of chelae oj first and second pereiopods without terminal tujts 

 of long hair. Carpus of second pereiopod longer than broad. Last 

 three pereiopods without horny scales or tubercles. IVIerus of third 

 pereiopod not noticeably broader than that of fourth. Appendix 

 masculina on second pleopod of male short {not overreaching appendix 



