40 
THE VOYAGE OF H.M.S. CHALLENGER. 
Macdonald places in this genus Atlanta rangii, Atlanta Jceraudrenii, and Atlanta 
lamanonii, which he states are “ characterised by having an involute instead of a spiral 
nucleus to the shell, greater fullness in the whorls, and a comparative^ small amount of 
calcareous matter as a component, particularly near the mouth and in the keel.” 
These observations are applicable to the two first-named species but not to the last. 
This, which I have previously referred to as Atlanta souleyeti, resembles the other species 
of Oxygyrus in having a membranous and not a hardened glossy keel to the shell as in 
the rest of the species of Atlanta , but it has not an involute spire, and the operculum 
according to Eydoux and Souleyet’s figure is quite of the normal type of Atlanta and not 
like that of Oxygyrus. I think, therefore, it should be retained in the former genus. 
Oxygyrus keraudrenii (Lesueur). 
1817. Atlanta keraudrenii, Lesueur, Journ. de Physique, vol. lxxxv. p. 391, pi. ii. 
1827. „ „ Rang, Mem. Soc. Hist. Nat. Paris, vol. iii. p. 380, pL ix. figs. 4, 5, 
6, 8. 
1830. „ „ Deshayes, Ency. Meth., vol. ii. p. 83. 
1830. ,, ,, Cuvier, R&gne Anim., ed. 2, vol. iii. p. 69. 
1832. „ ,, Rang, Mag. de Zool., classe v. pi. iv. figs. 1-7. 
1832-44. „ ,, Guerin, Icon. Rkgne Anim., pi. xi. fig. 2 (copy of Rang, 1832). 
1836. „ „ Deshayes, Cuvier’s R&gne Anim. Moll., pi. xxxviii. fig. 3 (copy of 
Rang, Mem. Soc. Hist. Nat.). 
1836. „ (Helicophlegma) keraudrenii, d’Orbigny, Voy. Amer. merid., vol. v. p. 169, 
pi. xi. figs. 16-23, pi. xx. figs. 3, 4. 
1839. ,, „ „ id., Hist. Nat. Canaries, Moll., p. 35. 
1840. „ bivonx , Pirajno Efem. Sci. Sicil., vol. xxviii. p. 14$ figs. 2a, b, b.c. 
1841. Helicophlegma keraudrenii, d’Orbigny, Sagra’s Hist. Cuba, Moll., vol. i. p. 99. 
1841. Atlante de keraudren, Eydoux and Souleyet, Voy. “Bonite,” Atlas Zool., pi. xviii. figs. 1-17. 
1841. Ladas keraudrenii, Cantraine, Mai. Mddit., p. 38, pi. i. fig. 2. 
1844. „ ,, Philippi, Enum. Moll. Sicil., vol. ii. p. 205. 
1847. Atlanta keraudrenii, Chenu, Lecons Elem. Hist. Nat., p. 132, fig. 419. 
1847. „ lesueurii (?), Loven, Ofversigt k. Vetensk.Akad. Forhandl., pi. iv. 
1848. Ladas keraudrenii, Requien, Cat. Coq. de Corse, p. 88. 
1850. Oxygyrus keraudrenii, Gray, Fig. Moll. Anim., pi. ccxl. figs. 2, 2 a (copy of Lesueur). 
1850. „ „ id., op. cit., pi. cxvii.c, fig. 3 (copy of Rang, 1832). 
1850. ,, „ id., op. cit., pi. cxvii.o, figs. 3-3c (copy of Rang, 1827). 
1850. „ „ id., op. cit., pi. cxvii.c, fig. 6 (copy of Cantraine). 
1850. „ „ id., op. cit., pi. ccxxxviii. fig. 3 (copy of Eydoux and Souleyet). 
1850. ,, „ id., op. cit., pi. cxvii.&, fig. 1 (copy of d’Orbigny). 
18501 Atlanta keraudrenii, Deshayes, Traite de Conch., pi. ci. figs. 1-4 (copy of Eydoux and 
Souleyet). 
1852. ,, ,, Souleyet, Voy. “Bonite,” Zool., vol. ii. p. 364. 
1852. „ „ Costa, Fauna Reg. Napoli, Eteropodi, p. 5, pi. i. fig. 3 (copy of 
Pirajno). 
1853. „ ,, V6rany, Journ. de Conchyl., vol. iv. p. 381. 
1854. Oxygyrus keraudrenii, H. and A. Adams, Gen. Moll., vol. ii. p. 92 ; vol. iii. pi. lxix. figs. 
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