THE GBAPSOID CRABS OP AMERICA. 347 



Epistome small, prominent. Buccal cavern a little narrowed and 

 arched anteriorly, completely closed by the outer maxillipcds. The 

 merus of the latter is subrectangular, bearing at its external angle 

 the palpus which is large and wholly exposed. The exognath is 

 also visible and provided with a flagellum. 



Chelipeds much stouter than the legs, more or less unequal in both 

 sexes; while comparatively smooth outside, they are armed on the 

 inner or prehensile surface with stout spines. 



Legs stout, clothed in part with coarse bristles, dactyli unarmed. 



The abdomen in the male has the fifth and sixth segments fused. 

 The basal segments do not wholly cover the sternum between the last 

 pair of legs. 



Restricted to America. Analogous species on opposite sides of the 

 continent: cordatus (Atlantic) ; occidentalis (Pacific). 



KEY TO THE SPECIES OF THE CEXUS DCIDES. 



A*. Carapace of male about li times as wide as long. Lower margin of pnlm 

 convex cordatus, p. 347. 



A*. Carapace of male 1$ times as wide as long. Lower margin of palm 

 straight accidcntalis, p. 350. 



UCIDES CORDATUS (Linnaeus). 



PAGURUS; KABURI. 

 Plates 110-113 ; plate 159, figs. 3 and 4. 



Vca vna MAKCCKAVE DE LIEBSTAD, Hist. Rer. Natur. Brazil, 1648, p. 184, 

 text-fig., male (type-locality, Brazil; type not extant). 



Cancer Pagurus, Jiirsuttis, Amcricanus, promts SEBA, Thesaurus, vol. 3, 

 1758, p. 51, pi. 20, fig. 4, male. 



Cancer cordatus LINNAEUS, Amoen. Acad., vol. 6, 1763, p. 414, male (type- 

 locality, America; type not extant). 



Cancer vca LINNAEUS, Syst. Nat., ed. 12, vol. 1, pt. 2, 1767, p. 1041 (type- 

 locality, America; type not extant). 



Cancer uca HERBST, Natur. Krabben u. Krebse, vol. 1, 1783, p. 128. 



Cancer cordattis HEUBST, Natur. Krabben u. Krebse, vol. 1, 17S3, p. 131, 

 pi. 6, fig. 38, after Seba. 



Cangrejos Ajaes de Manglar PARRA, Descripcion de diferentes piezas de 

 Historia Natural, Havana, 1787, p. 106, pi. 59 (male and female). 



Ocypode cordata LATREILLE, Hist. Nat. Crust, vol. 6, an XI [1S02-1S03], 

 p. 37, pi. 46, fig. 3, after Herbst. 



Ocypode fossor LATEEILLE, Hist. Nat. Crust., vol. 6, an XI [1802-1803], 

 p. 38, female (type-locality, Cayenne; type in Paris Mus.). 



Ocypode vca LATREILLE, Gen. Crust., vol. 1, 1806, p. 31. 



Gecarcinus uca LAMARCK, Hist. Nat. Anim. sans Vert., vol. 5, 1818, p. 251. 



Cccarcinns fossor DESMAREST, Consid. Gen. Crust., 1825, p. 114. 



Uca uca LATREILLE, Cours d'Entom., 1831, p. 338. 



Ocypode (uca) uca DE HAAN, Fauna Japon., Crust., p. 29, 1835, pi. c. 



Uca una GUERIN, Icon. Regne Anim. Cuvier, pi. 5, fig. 3, female. MILNE 

 EDWARDS, Hist. Nat. Crust, vol. 2, 1837, p. 22, female; Ann Sci. Nat, 

 ser. 3, Zool., vol. 20, 1853, p. 206 [172], pi. 10, fig. 2. YOUNG, Stalk- 

 eyed Crustacea Brit., Guiana, 1900, p. 252, pi. 7 (female, colored plate). 



