240 GASTEROPOBA. 



Upper Eocene. — Barton Beds. Barton ; High Cliff. 



Middle P^ocene. — Brackks/iam Beds. Brackleshani Bay ; Stubbington ; 



Bramshaw ; Brook. 

 Lower Eocene. — London Clay. Bognor ; Portsmoutli ; Ilampstead ; Belsize 



Lane; Potter's Bar; Highgate ; llaver.stock Hill ; Finchley; Clarendon; 



Basingstoke; Southampton; Alum Bay (no. 4 Bed). — Woolwich Beds. 



Biclcley. — Thanet Beds. Heme Bay. 



Natica Nose, Orbigny, 1850. 



Natica i/laucmoides . 



Coq. Foss. Paris, 1829, vol. ii. pi. xx. figs. 7, 8, p. 160, non J. Sowerby. 



Natica Noee. 



Prod. Pal. Strat. 1850, vol. 2. p. 41.3. 



Desc. Anim. sans Vert. 1864, vol. iii. p. 55. 



Ann. Soc. K. Mai. Belgique, 1888, vol. xxiii. p. 160. 



Horizon and Locality. 

 Upper Eocene. — Barton Beds. Barton. 



Natica obovata, J. de C. Sowerby, 1850. 



Natica obovata. 

 Dixon's ' Sussex,' 1850, pi. vi. fig. 28, pp. 98, 178. (Dixon Coll.) 



Horizon and Localities. 



Middle Eocene. — Bracklesham Beds. Bracklesham Bay ; Stubbington. 



Natica turgida, J. de C. Sowerby, 1850. 



Natica turgida. 

 Dixon's ' Sussex,' 1850, p. 178. (Dixon Coll.) 



Horizon and Locality. 



Middle Eocene. — Bracklesham Beds, Bracklesham Bay. 



Natica venustaj Deshayes, 1864. 



Natica vemtsta. 



Desc. Anim. sans Vert. 1864, vol. iii. pi. Ixviii. figs. 7, 8, p. 38. 



Naticina venusta. 



Ann. Soc. R. Mai. Belgique, 1888, vol. xxiii. p. 165. 



Horizon and Locality. 

 ]Middle Eocene. — Bracklesham Beds. Brook. 



Genus SIGARETUS, Lamarck, 1799. 

 M6m. Soc. Hist. Nat. Paris, 1799, p. 77. 



Sigaretus clathratus, Gmelin, 1790. 



Nerita. 



Schroeter's 'Einl. Conchyl.' 1784, vol. 2. pi. 4. fig. 15, p. .332. 



Nerita clathrata. 

 Gmelin's Linnaeus, Syst. Naturse, ed. 13, 1790, p. 3675. 



aii/aretus caiudiculutus. 

 'Jlineral Conchology, 1823, pi. 384. (Sowerby Coll.) 

 Coq. Foss. Paris, 1829, vol. ii. pi. xxi. figs. 13, 14, p. 182. 

 Dixon's ' Sussex,' 1850, pi. v. tig. i», p. 98. (Dixon Coll.) 



