VOL. XIV. (I) FOREST BED—PALEONTOLOGY oe 
Arion ater (Linn). Four calcareous granules, which 
exactly correspond with the internal granules commonly 
found in this species, are referred to this form. It is only 
quite recently that this species has been detected ina fossil 
state in this country, since these remains are so easily 
overlooked. It is known from the Pleistocene of Grays 
and Ilford, and from several deposits of later age. It is 
widely distributed throughout Europe, and has been 
recorded from Madeira, the Azores, Heligoland and the 
Fares. 
Pyramidula rotundata (Miill.) Numerous examples. An 
abundant form with us at the present day. It ranges 
throughout Europe, and is known from the Azores and 
Madeira. It is a common form in Post-Pliocene beds. 
Hygromia hispida (Linn.) Common and very variable. 
This form is found throughout Europe and Siberia, and 
has been introduced into North America. It is known 
from the Butleyan (Red Crag of Butley) of this country, 
and it is abundant in Pleistocene and Holocene deposits. 
Vallonia pulchella (Mill.) Eleven examples. This 
species is circumpolar in its distribution, ranging as far as 
Central Asia and China, whilst it has been found at 
St. Helena. This extensive range is in accordance with 
its past history, since it is found in the Icenian (Norwich 
Crag), of this country, and on the Continent it occurs in 
the middle Miocene of Steinheim, in Witrtemburg (as 
V. subpulchella, Sand). 
Helicigona arbustorfum (Linn). Six examples. This is 
another ancient form occuring in the Butleyan of this 
country, and in later beds. At the present time it is com- 
monly distributed throughout these Islands and northern 
Europe, and has been found in Lapland and Iceland. 
Helix nemoralis, Linn. Common. This species is 
truly confined to Europe, though it has been introduced 
into North America. It is known from the Butleyan, and 
from the Pliocene of Holland. 
