160 BULLETIN 152, UNITED STATES NATIONAL MUSEUM 

 Genus PELTARION Jacquinot 



Peltarion ^o Jacquinot, d'Urville's Voy. au Pole Sud 1837-1840, atlas, Crust., 1847 

 (?),2i pi. 8, figs. 1-3; type, P. magellanicus; text, Zool., vol. 3, 1853, p. 80. — 

 White, List Crust. Brit. Mus., 1847, p. 52. — Dana, U. S. Expl. Exped. vol. 

 13, Crust., pt. 1, 1852, p. 298; pt. 2, 1853, p. 1425.— Stebbing, Proc. Zool. 

 Soc. London, 1900, p. 519, and synonymy. 



Hypopeltarhan Miers, Challenger Rept., Zool., vol. 17, 1886, p. 210; type, H. 

 spinulosum (White). — Rathbun, Proc. Biol. Soc. Washington, vol. 11, 1897, 

 p. 165. 



Hypopeliarion Ortmann, Zool. Jahrb., vol. 7, 1893, p. 421. 



Carapace suborbicular or broad oval; anterior half broader; very- 

 convex, strongly deflexed anteriorly; surface rough, median sutures 

 deep. Rostrum horizontal, triangulate, tridentate, median tooth 

 larger and more advanced than lateral. Anterior and lateral margins 

 dentate, teeth shallow, edges spinulous. Orbits 4-toothed. Eye 

 stalks slender, curved, capable of concealment within the orbits. 

 Basal article of antenna very short, next article longer. Merus of 

 outer maxilliped somewhat longer than wide, broadly truncate at 

 insertion of palp. Chelipeds stout. Carpus and propodus of legs of 

 subequal length. Abdomen of male small, narrow. * 



South and middle America. 



KEY TO THE SPECIES OF THE GENUS PELTARION 



A^ Carapace as broad as long or nearly so. Chelipeds equal. Third, fourth, 

 and fifth segments of male abdomen fused spinulosum, p. 160. 



A*. Carapace distinctly longer than broad. Chelipeds very unequal. No 

 abdominal segments fused dextrum, p. 161. 



PELTARION SPINULOSUM (White) 



Plate 69, Figures 1 and 2 



Atelecyclus spimdosus White, Ann. Mag. Nat. Hist., ser. 1. vol. 12, 1843, p. 345 



(type-locality, Falkland Islands; type in Brit. Mus.). 

 ? Atelecyclus chilensis Nicolet in Gay, Hist. Chile, Zool., vol. 3, Crust., 1849, 



p. 175 (type-locality, Bay of Valparaiso; type not extant). Not A. chilensis 



Milne Edwards, 1837. 

 Peltarion magellanicus Jacquinot, d'Urville's Voy. au Pole Sud 1837-1840, atlas, 



Cru.st., 1847 (?), pi. 8, figs. 1-3; text, Zool., vol. 3, 1853, p. 83 (type-locality, 



Sts. of Magellan; type in Paris Mus.). 

 Peltarion spinulosum ( = Corystes spin.) White, List Crust. Brit. Mus., 1847, 



p. 52.— Dana, U. S. Expl. Exped., vol. 13, Crust., pt. 1, 1852, p. 304; atlas, 



1855, pi. 18, fig. 6a and b; southern Patagonia. — Cunningham, Trans. Linn. 



Soc. London, vol. 27, 1871, p. 494; Sts. of Magellan.— Miers, Proc. Zool. 



Soc. London, 1881, p. 68. — A. Milne Edwards, Miss. Sci. du Cap Horn 



1882-1883, vol. 6, zool.. Crust, 1891, p. F. 17.— Stebbing, Proc. Zool. Soc. 



London, 1900, p. 519, and synonymy. — Bouvier, in A. Milne Edwards and 



Bouvier, Mem. Mus. Comp. Zool., vol. 47, 1923, p. 306. 



20 Peltarion not to be displaced hy PeUarium Fischer de Waldheim. 1844. See International Rules of 

 Zoological Nomenclature, Art. 36, Recommendations, in Proc. Biol. Soc. Washington, vol. 39, 1926, p. 87. 



21 As White in 1847 cites the atlas of Uombron and Jacfiuinot, it must have been issued ai early as 1847. 



