THE GBAPSOID CRABS OF AMERICA. 347 



Epistome small, prominent. Buccal cavern a little narrowed and 

 arched anteriorly, completely closed by the outer maxillipeds. The 

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

 the palpus which is large and wholly exposed. The exognath 13 

 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) ; occidentalls (Pacific). 



KEY TO THE SPECIES OF THE GENDS UCIDES. 



A*. Carapace of male about li times as wide as long. LoAver margin of palm 

 convex cordains, p. 347. 



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

 straight occidcntalis, p. 350. 



UCIDES CORDATUS (L?nnaeus). 



PAGURUS: KABURI. 



Plates 110-113 ; plate 150, figs. 3 and 4. 



Vca vna Makcgbave de Liehstad, Hist. Rer. Natnr. Brazil, 1G48, p. 184, 

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



Cancer Fagunts, hirsvtus, Americanus, promts Seba, Thesaurus, vol. 3, 

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



Cancer cordatus Linnaeus, Amoen. Acad., vol. 6, 17G3, p. 414, male (type- 

 locality, America; type not extant). 



Cancer vca Linnaeus, Syst. Nat., ed. 12, vol. 1, pt. 2, 17G7, p. 1041 (type- 

 locality, America; type not extant). 



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



Cancer cordatus Herbst, Natur. Krabben u. Krebse, vol. 1, 1783, p. 131, 

 pi. 6, fig. 38, after Seba. 



Cangrcjos Ajaes de Manglar Parra, Descripcion de diferentes piezas de 

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



Ocypode cor data Latreille. Hist. Nat. Crust., vol. G, an XI [1802-1803], 

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



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

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



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



Gccarcinns vca Laiiarck, Hist. Nat. Anim. sans Vert., vol. 5, 1818, p. 251. 



Gccarcinns fossor Dessiarest, Consid. Gen. Crust., 1825, p. 114. 



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



Ocypode Uica) nca de Haan, Fauna Japon., Crust, p. 29, 1835, pi. c. 



Uca una Gu£rin, 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 [1721. pl. 10, fig. 2.— Young. Stalk- 



'.h eyed Crustacea Brit., Guiana, 1900, p. 252. pl. 7 (female, colored plate). 



