274 GASTEROPODA. 



• Genus MEGASPIRA, Isaac Lea, 1836. 

 Observ. Unio &c. 1836, vol. 2. pi. xxiii. lig. 101, p. 21. 



Megaspira cylindrica (Edwards, MS.), J. S. Gardner, 1885. 



Met/anpira (i/ttndrica. 

 Geol. Mag. 1885, p. 251. 



Horizon and Locality. 



Lower Eocene.— ionrfon Clay. Boreliam Wood, Finchley. 



Megaspira monodonta, Edwards (MS.). 



Horizon and Locality. 



Oligocene. — Bembridye Beds. Headon Hill. 



Genus ACHATINA, Lamarck, 1799. 

 M6m. Soc. Hist. Nat. Paris, 1799, p. 75. 



Achatina cylindrica, Edwards (MS.). 



Horizon and Locality. 



Oligocene. — Bembridye Beds. Bembridge. 



Genus COCHLICOPA (Fdrussac, 1819), Eisso, 1826. 



Tabl. Syst. Anini. Moll. (Liraa9()ns), 1819, p. 51 {partim). 

 Hist. Nat. Europe M(5r. 1826, vol. 4. p. 79. 



Zua (Leach, MS.), J. E. Gray, 1840. 

 Turton's Man. Shells British Islands, new ed. 1840, p. 187. 



Cochlicopa dubia, Edwards (MS.). 



Horizon and Locality. 



Oligocene. — Bembridye Beds. Headon Hill. 



Cochlicopa Headonensis, Edwards (MS.). 



Horizon and Locality. 



Oligocene. — Bembridye Beds. Headon Hill. 



Family AURICULID^, Risso. 



Genus MELAMPUS, Montfort, 1810. 

 Conch. Syst. 1810, vol. 2. p. ai9. 



Melampus tridentatus, Edwards, 1852. 



Melampus tridentaius. 



Mon. Pal. Soc. 1852, pi. x. figs. 4", 4\ p. 11.3. 

 Ohenu'.s Man. Conchyl. 1859, vol. i. fig. 3522, p. 477. 



Horizon aiul Locality. 

 Oligocene. — Headon Beds. Headon Hill. 



