230  GA8TEK0P0DA. 



Nematura luhrieella. 

 Land- u. Siissw.-Conch. 1873, pi. xx. fig. 23, p. 341. 



Horizon and Locality. 

 Oligocene. — Headon Beds. Ilordwell. 



Stenothyra medianay Deshayes, 1862. 



Bithinia mediana. 

 Desc. Anim. sans Vert. 1862, vol. ii. pi. xxxv. figs. 43-45, p. 618. 



Nematura mediana. 



Land- u. Sussw.-Conch. 1873, pi. xiv. fig. 9, p. SM, 



Stenothyra mediana. 

 Ann. Soc. R. Mai. Belgique, 1888, vol. xxiii. p. 220. 



Horizons and Localities. 

 Oligocene. — Hempstead Beds. Hempstead. — Headon Beds. Hordwell; 

 Colvrell Bay. 



Stenothyra Parkinsoni, J. Morris, 1854. 



Hydrohia Parhinsoni. 

 Quart. Journ. Geol. Soc. 1854, vol. x. pi. ii. fig. 21, p. 100. 



Amnicola Parhinsoni. 



Land- u. Siissw.-Conch. 1872, pi. ix. fig. 0, p. 180. 



Horizon and Locality. 



Lower Eocene. — Woolwich Beds. Upnor. 



Stenothyra parvula (Deshayes, MS.), J. Morris, 1856. 



Paludina paroiila. 

 Deshayes, MS. 



Nematura parvula. 



Forbes's ' Isle of Wight,' Mem. Geol. Siirv. 1850, pi. iv. fig. 4, p. 152. 



Horizon and Localities. 



Oligocene. — Headon Beds. Oolwell Bay ; Hordwell ; Mead End. 



Stenoth3rra pupa, Nyst, 1836. 



Paludina jmpa. 

 Messager Soi. Arts Belgique, 1830, pi. i. fig. 00, p. 105. 



Hydrobia ? pupa. 



Forbes's ' Isle ofWight,' Mem. Geol. Surv. 1866, p. 40. 



BiiMnia pupa. 



Desc. Anim. sans Vert. 1862, vol. ii. pi. xxxv. figs. 1-4, p. 517. 



Nematura pupa. 



Conchyl. Mainzer Tert. 1803, pi. vi. fig. 0, p. 78. 



Horizon and Locality. 



Oligocene. — Hempstead Beds. Hempstead. 



