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VOL. XIV. (1) FOREST BED—-PALEONTOLOGY 4I 
form throughout Europe and North America, and its 
range also extends-to Asia, and the Azores, Madeira, and 
the Canary Islands, a distribution which agrees with its 
antiquity, since it is known from the Icenian of 
Bramerton. 
Vitrina pellucida, Mill. One example. This species 
is extremely rare as a fossil in these islands. It is known 
from the Holocene of Greenhithe (Pre-Roman), and from 
the Post-Roman deposits of Otford and East Farleigh. 
It is unrecorded from the later Pleistocene, though it is 
known from the Cromerian. At the present day it is 
circumpolar in its distribution. 
Vertigo pygmexa, Drap. One example. It is known 
from numerous Holocene and Pleistocene beds. It is 
similar in its distribution to the preceding form. 
Vertigo minutissima, Hart. One example. This species 
has hitherto been unrecorded from the Holocene of 
England, though it is known from the Pleistocene of 
Westminster, Barnwell, and Ightham. It is widely 
distributed throughout Europe, and has been recorded 
from Madeira. 
Planorbis lineatus, Walk. Several examples. It is a 
rare form in both Holocene and Pleistocene beds. A 
widely distributed form in Europe; its range also extends 
into Central Asia. 
There is thus a total of forty-five species of Mollusca 
known from Westbury, and though this number is 
exceeded by many other Holocene beds, yet there are few, 
if any, which have yielded so many interesting and rare 
forms. 
D2 
