40 PROCEEDINGS COTTESWOLD CLUB I90I 
indicates climatic conditions similar to those of the 
present day, while the deposit itself represents a swamp 
which was liable to floods. Since such a formation at this 
spot at the present time would contain estuarine forms, 
it follows that when this deposit was laid down the tide 
did not reach so far up the Severn as it does now, because 
the land stood relatively higher above the sea. Sucha 
condition is known to have obtained in nearly all parts of 
England. A similar deposit occurs in the lower Thames 
Valley, where the peat is certainly pre-Roman, for Roman 
interments are found in it. The total absence of all 
charcoal and other indications of human presence in the 
beds at Westbury materially strengthens the view that 
they are of some antiquity. Perhaps when the similar 
deposits in other parts of this country have received the 
attention which they undoubtedly deserve, we shall be in 
a position to pronounce definitely as to their age. 
ADDENDUM. 
Since the above paper was read, Dr. Prevost has for- 
warded some more material which, on examination, has 
yielded several species not previously recorded. It is 
worthy of note that it contained every form in our first 
list with one exception, viz. :—Vertigo moulinsiana. 
The new records are :— 
Punctum pygmeum, Drap. Of this species one example 
only was found. It is rare in other Holocene beds, and 
equally so in the Pleistocene. At the present day it is 
circumpolar in its distribution. 
Sphyradium edentulum, Drap. One imperfect example. 
It is known from the Holocene, of Chignal St. James’, 
Shalford, and Crossness, and from the Pleistocene of 
Copford, Clacton, and Barnwell. It isa widely-distributed 
