34 PROCEEDINGS COTTESWOLD CLUB I90I 
Vitrea crystallina (Miill.) Twelve examples. This is 
another common form in Post-Pliocene deposits, and it is 
widely distributed in the British Isles. On the Continent 
it is acommon species, and it is also known from the 
Azores, Madeira, and the Canaries. 
Vitrea cellaria (Miill.) Six examples, of which only one 
is mature. This form has been recorded from several 
Holocene beds, including Westminster, Crossness, Lea 
Valley, Roxwell, and Shalford. It is known in the 
Pleistocene of Copford, Barnwell, and Ightham. At the 
present time it possesses a wide distribution, not only in 
these Islands, but throughout Europe, as well as Algeria 
and Morocco; and it has been introduced from Europe 
into North America. 
Vitrea nitidula (Drap.) About a dozen examples. This 
is an abundant form in the Holocene beds, but in the 
Pleistocene it is only known from the same localities as 
the preceding form. It is a widely-spread species in this 
country, and also throughout Europe. 
Vitrea radiatula (Ald.) Two examples. This form is 
known from numerous Pleistocene and Holocene deposits. 
A widely-distributed species in these Islands, it has an 
extended range in Europe, and has been recorded from 
Siberia and the Farée Islands, whilst it is common in 
North America. 
Vitrea nitida (Miill.) Numerous examples. Though 
not so widely distributed as the preceding species, it 
ranges throughout Europe and part of the United States, 
Central Asia, and as far as Afghanistan. It is one of the 
most abundant of the land mollusca in Post-Pliocene 
deposits. 
Vitrea fulva (Miill.) Twospecimens. This species has 
perhaps a wider range than any other British land-shell, 
being circumpolar, and extending as far as Central Asia, 
China, and the Azores. It is known from numerous 
Post-Pliocene beds. 
