PROSOBRANCHIATA. HISSOID«. 233 



Rissoina puncticulata) Deshayes, 1861. 



Rissoina puncticulata. 

 Desc. Anim. sans Vert. 1861, vol. ii. pi. xxiv. figs. 25-28, p. 395. 



Zehinella jruncticulata. 

 Ann. Soc. R. Mai. Belgique, 1888, vol. xxiii. p. 238. 



Horizon and Localities, 



Middle Eocene. — Bracklesham Beds. Bram.shaw ; Brook : Whitecliff Bay. 



Rissoina Raincourti, Cossmnnii, 188."). 



liissoina liaincourti. 



Joum. Concliyl. 1886, pi. viii. fig. (i, p. 201. 



Ann. Soc. R. Mai. Belgique, 1888, vol, xxiii. pi. ix. figs. 3, 4, p. 237. 



Horizon and Locality. 

 Upper Eocene. — Barton Beds. High Cliff. 



Genus COSSMANNIA, 11. B. Newton, 1891, nom. mut. 



Diastictus, Cossmann, 1888. 

 Ann. Soc. R. Mai. Belgique, 1888, vol. xxiii. p. 233, non Mulsant, 1842. 



Cossmannia expansa, Deshayes, 1861. 



Rissoina e.vpansa. 

 Desc. Anim. sans Vert. 1861, vol. ii. pi. xxiv. figs. 7-9, p. 396. 



Diastictus expansus. 



Ann. Soc. R. Mai. Belgique, 1888, vol. xxiii. pi. ix. figs. 17 k 49, p. 2-34. 

 Horizons and Localities. 



Upper Eocene. — Barton Beds. High Cliff'. 



Middle Eocene. — Bracklesham Beds. Brook. 



Genus TATEA, .J. E. Tonison-Woods, 1 87i». 

 Papers Proc. Rep. U. Soc. Tasmania, 1879, p. 72. 



Tatea conica, J. de C. Sowerby, 1820. 



Melania F 

 Bnlimus conicus't 

 Mineral Conchology, 1826, vol. vi. p. 01 (reference only), non Brard. 

 (Sowerby Coll.) 



Horizons and Localities. 



Oligocene. — Headon Beds. Ilordwell. 

 Upper Eocene. — Barton Beds. Barton. 



Genus POTAMACLIS, Sandberger, 1873. 

 Land- u. Siissw.-Conch. 1873, p. 312. 



Potamaclis Forbesi, Morris, 1850. 



Melania Forhesii. 



Forbes's ' Isle of Wight,' Mem. Geol. Surv. 1856, pi. iii. fig. 15, p. 161. 



Horizon and Locality. 

 Oligocene. — Bembridge Bedn. Hempstead. 



