THE CANCROID CRABS OF AMERICA 33 



12.3, width at last tooth 17.4, fronto-orbital width 14, width between 

 orbits 10 mm. 



Range. — Uruguay to Patagonia. 



Material examined. — See table, page 32. 



Subfamily Thalamitinae (Lupinae Alcock) 



Chelipeds longer, usually much longer, than any of the legs, the 



first three pairs of which have a tendency to be slender; the last pair 



are swimming paddles. Carapace commonly conspicuously broad; 



antero-lateral borders usually cut into 9 distinct teeth, exceptionally 



5 or 4. 



Genus PORTUNUS Weber 



Portunus Weber, Nomenclator entomologicus, 1795, p. 93; type, P. pelagicus 



(Linnaeus, 1758)= Cancer reticulatus Herbst, 1799. — Fabricius, Supple- 



metum Entomologiae Systematicae, 1798, p. 325. — Rathbun, Proc. Biol. 



Soc. Washington, vol. 11, 1897, pp. 155 and 160. Not Portunus Leach, 



Edin. Encyc, vol. 7, 1814, p. 390 [228]. 

 Lupa Leach, Edin. Encyc, vol. 7, 1814, p. 390 [228]; type, L. pelagica (Linnaeus). 



Not Lupa de Haan, Fauna Japon., Crust., 1833, p. 11. 

 Lupania Rafinesque, Amer. Monthly Mag., vol. 3, 1818, p. 272 (substituted for 



Lupa Leach). 

 Neptunus de Haan, Fauna Japon., Crust., 1833, pp. 3 and 7; subgenus of Portunus; 



type, P. (N.) pelagicus (Linnaeus). 

 Achelous de Haan, Fauna Japon., Crust., 1833, pp. 3 and 8; subgenus of Portunus; 



type, P. {A.) spinimanus Latreille. 

 Amphitrite de Haan, Fauna Japon., Crust., 1833, pp. 3 and 8; subgenus of 



Portunus; type, P. (A.) gladiator Fabricius. 

 Pontus DE Haan, Fauna Japon., Crust., 1833, pp. 3 and 9; subgenus of Portunus; 



type, P. (Pontus) convexus de Haan. 

 Monomia Gistel, Naturgeschichte des Thierreichs, 1818, p. viii (substituted for 



Amphitrite, preoccupied). 

 Posidon Herklots, Addit. Faun. Africae Occid., 1851, p. 3; type, P. validus 



Herklots. 

 Xiphonectes A. Milne Edwards, Nouv. Arch. Mus. Hist. Nat. Paris, vol. 9, .1873, 



p. 157; type, X. vigilans (Dana). 

 Hellenus A. Milne Edwards, Crust. Reg. Mex., 1879, pp. 210 and 221; subgenus 



of Neptunus; type, A''. {H.) spinicarpus (Stimpson). 



Carapace transverse, usually broad, and depressed or little convex, 

 often with surface areolated. Front proper well delimited from inner 

 supra-orbital angles and cut into from three to six—usually four — teeth ; 

 its breadth is from a sixth to a fifth the greatest breadth of carapace 

 (lateral epibranchial spines not included). Antero-lateral borders 

 oblique, arched, longer than postero-lateral, cut into nine teeth 

 (including outer orbital angle), of which the ninth may be enlarged. 

 The orbit usually has two fissures or sutures in upper border, which 

 border is less prominent than lower border, so that the orbit very often 

 has a dorsal inclination; the lower border has a fissure or suture near 

 the outer angle inner angle dentiform and usually very prominent 

 79856—30 4 



