1900.] FROM THE FALKLAND ISLANDS. 519 



Brachyura proper. To the Atelecyclidse be assigns the genera 

 Hypopeltarion and Atelecyclus. Miers, who in 1886 placed Hypo- 

 peltarium together with Gomeza in a legion Corystoidea, recognized 

 that Hypopeltarium was nearly allied to Atelecyclus, and that these 

 approached the Cyclinea, while Gomeza was a typical Corystoid. 

 Alcock includes in his subfamily Atelecyclus M.-Edw., Ei-imacrus 

 Benedict, 1892, Hypopeltarium Miers, Pliosoma Stimpson, 1862, 

 Telmessus White, 1846, Tr achy car cinus Faxon, 1893, and Tricho- 

 peltarium A. M.-Edwards, 1880. 



Genus Peltarion Jacquinot. 



1843-1847 '. Peltarion, Jacquinot, D'Urville's Voy. au Pole 

 Sud, Atlas, Crustacea, pi. 8. fig. 1 (without definition). 



1847. Peltarion, White, List of Crustacea in British Museum, 

 p. 52. 



1852. Peltarion, Dana, U.S. Expl. Exp. vol. xiii. p. 298. 



1853. Peltarion, Lucas, D'Urville's Voy. au Pole Sud, Zoologie, 

 vol. iii. Crustaces, p. 80. 



1871. Peltarion, Cunningham, Tr. Linn. Soc. London, vol. xxvii. 

 p. 494. 



1881. Peltarion, Miers, Pr. Zool. Soc. London, 1881, p. 68. 



1886. Hypopeltarium, Miers, ' Challenger ' Brachyura, Eeports, 

 vol. xvii. p. 210. 



1893. Hypopeltarion, Ortmann, Zool. Jahrb. vol. vii. p. 421. 



1897. Hypopeltarium, M. J. Eathbun, Pr. Biol. Soc. Washington, 

 vol. xi. p. 165. 



1899. Hypopeltarium, Alcock, J. Asiat. Soc. Bengal, vol. lxviii. 

 pt. 2, p. 96. 



Miers considered that the name Peltarion was preoccupied, 

 apparently because in 1844 Eischer de Waldheim had named a 

 genus of Coleoptera, not Peltarion but Peltarium. He distinguishes 

 the genus from Atelecyclus " by its narrower, three-spined front, 

 the spinuliferous, not dentated, antero-lateral margins of the cara- 

 pace, and the shorter, more truncated merus [fourth] joints of the 

 exterior maxillipeds." 



Peltarion' spinosxtlum White. 



1843. Atelecyclus spinosulus, White, Ann. Mag. Nat. Hist. ser. 1, 

 vol. xii. p. 345'fquoted by White in 1847 as ' C'orystes spin.'). 



1843-1847. Peltarion magellanicus, Jacquinot 2 , Voy. au Pole Sud, 

 Atlas, Crust, pi. 8. figs. 1-3. 



1 The Atlas to the Voyage of the ' Astrolabe ' and ' Zelee ' ' au Pole Sud et clans 

 l'Oceanie,' 1837-1840, has a general titlepage dated 1842-1853. Of the 

 Crustacea, plate 8 is quoted by White in 1847. 



2 The genus and species are sometimes assigned to Hombron and Jacquinot, 

 who appear to have been both engaged in collecting the specimens obtained by 

 the expedition ; but as the figures of the Crustacea are attributed to Jacquinot 

 by Lucas, who drew up the descriptions, there is nothing on which Hombron's 

 claim to authorship can properly be founded. 



