PROSOBRAITCHIATA. — UMBONIID^. 253 



Neritina tristis, Forbes, 1856. 



Neriti7ia tristis. 



Forbes's ' Isle of Wight,' Mem. Geol. Surv. 1856, p. 46. 

 Men. Pal Soc. 1877, pi. xxxiv. figs. 12", 12'>, p. 347. 



Horizons and Localities. 



Oligocene. — Hempstead Beds. Hempstead. — Headon Beds. East Cowes. 



Neritina vicina, Melleville, 1843. 



Neritina vicina. 



Ann. Sci. Geol. (A. Riviere), 1843, vol. 2. pi. vi. figs. 11, 12. 



Neritina jaspidea. 

 Desc. Anim. sans Vert. 1864, vol. iii. pi. ixv. figs. 14-16, p. 20. 

 Mon. Pal. Soc. 1877, pi. xxxiv. figs. 17", 17", p. 345. 



Neritina vicina. 



Bull. Soc. G(5ol. France, 1885, ser. 3, vol. xiii. p. 201. 



Ann. Soc. E. Mai. Belgique, 1888, vol. xxiii. p. 85. 

 Horizon and Locality. 



Lower Eocene. — Woolwich Beds. Bickley. 



Jamily UMBONIID^, A. Adams. 



Genus TEINOSTOMA, H. & A. Adams, 1857. 

 Genera Eec. Moll. 1857, vol. i. p. 122. 



Teinostoma sestaarinum, Edwards (MS.). 



Horizon and Locality. 



Oligocene. — Headon Beds. Hordwell. 



Teinostoma callisttun, Edwards (MS.). 



Horizon and Locality. 



Middle Eocene. — BracMesham Beds. Bramshaw. 



Teinostoma decussatum, Sandberger, 1863. 



Adeorbis decussatus. 



Conch. Mainz. Tert. 1863, pi. xi. fig. 16, p. 136. 



Teinostoma decussatum. 



Desc. Anim. sans Vert. 1864, vol. ii. pi. Ixiii. figs. 1-4, p. 923. 

 Horizon and Locality. 



Oligocene. — Hempstead Beds. Hempstead. 



Teinostoma dnbitun, Lamarck, 1804. 



Helicina dubium. 



Ann. Mus. 1804, vol. 6. p. 91. 



Coq. Foss. Paris, 1824, vol. ii. pi. vi. figs. 14, 15, p. 58. 



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