NATICA TENUIS. 681 



Natica tenuis, Etheridge and Bell. Plate LV, fig. 11. 



1898. Natica tenuis, A. Bell, Trans. Roy. Geo!. Soc Cornwall, vol. xii, p. 145. 



Specific Characters. — Belongs to the X. Beyrichi group, but is minute and of a 

 thinner texture, with an acute and projecting apex, a smaller and rounded 

 umbilicus, a strong and conspicuous umbilical ridge, and a narrow, more delicate 

 and less expanded inner lip. 



Dimensions. — L. 11 mm. B. 10 mm. 



Distribution. — Not known living. 

 Fossil : St. Erth. 



Uemarlcs. — There are two specimens in the Warburton Collection at the 

 British Museum under this name, one of which is here figured. They have been 

 described by Mr. Bell as specifically distinct under the present name. 



Sub-genus LUNATIA, Gray, 1847. 

 Natica (Lunatia) catena (Da Costa). Plate LIV, figs. 1 — 3. 



1778. Cochlea catena, Da Costa, Hist. Nat. Test, Brit., p. 83, pi. v, fig. 7. 



1838. Natica monilifera, Lamarck, Hist. Anini. sans Vert., ed. 2, vol. viii, p. 638. 



1842—48. Natica catena, S. V. Wood, Ann. Mag. Nat, Hist. [1], vol. ix, p. 529, 1842; Mon. Crag 



Moll., pt. i. p. 142, pi. xvi, fig. 8, 1848. 

 184-0. Natica monilifera, LoTen, K. Sveusk. Vet.-Akad. Forh.. vol. iii, p. 89. 

 1853. Natica monilifera, Forbes and Hanley, Brit. Moll., vol. iii, p. 326, pi. c, fig. 1. 

 1859. Natica monilifera, G. B. Sowerby. 111. Ind. Brit, Shells, pi. xvi, fig. 17. 

 1867 — 71. Natica catena, Jeffreys, Brit. Conch., vol. iv, p. 220, 1867; vol. v, p. 215, pi. lxxviii, fig. 4. 



1869 ; Quart. Journ. G-eol. Soc, vol. xxvii, p. 489, 1871. 



1871. Natica catena, A. Bell, Geol. Mag., vol. viii, p. 454. 



1872. Natica catena, A. and E. Bell, Proc. Geol. Assoc, vol. ii, pp. 209, 213, 216. 



1873 — 77. Natica catena, Seguenza, Boll. R. Corn. Geol. I tab, vol. iv. p. 352, no. 256, 1873 ; vol. v, 



p. 280, no. 99, 1874: vol. vii, p. 10, no. 484, 1877. 

 1878. Natica catena, Mouterosato, Enum. e Stnon. Conch. Medit. (Giorn. Sci. Nat. ed Econ. Palermo, 



vol. xiii), p. 36. 

 1878. Natica catena, J. Reeve, Proc. Norwich Nat, Soc, vol. i, p. 70. 

 1883. Natica (Naticina) catena, Bucquoy, Dautzenberg et Dollfus, Moll. mar. Rouss., vol. i, p. 146, 



pi. xvii, figs. 5, 6. 

 1890. Natica catena, C. Reid, Plioc Dep. Brit., p. 248. 

 1890. Natica (Naticina) catena, Cams, Prod. Faun. Medit,, vol. ii, p. 304. 

 1892. Natica catena, Van den Broeck, Bull. Soc. Belg. Geol., vol. ri (Mcmoires), pp. 122, 132. 

 1892. Natica calenata, Locard, Coq. mar. Cotes de France, p. 182, tig. 157. 

 1901. Natica (Naticina) catena, Kobelt, Icon, schalentrag. europ. Meeresconcli., vol. ii. p. 89, pi. liv, 



figs. 5—8. 

 1903. Natica monilifera, Lamjjlugh, Mem. Geol. Survey — Geol. Isle of Man, p. 475. 

 1912. Natica (Naticina) catena, Dautzenberg et Fischer, Camp. Scient., Prince de Monaco, vol. xxxvii 



(Mollusques), p. 229. 

 1912. Natica catena, Tesch, Med. v. d. Rijks. v. Delfstoffen, No. iv, p. 64, no. 142. 

 1919. Natica (Lunatia) catena, Cossmann et Peyrot, Conch. Ne'ogen. de l'Aquitaine, vol. iii, p. 392. 



