300 PROCEEDINGS OF THE MALACOLOGICAL SOCIETY. 



other part of the Thames estuary. It has been suggested that this form 

 also is not truly a native of this country, but besides the examples 

 from the peat near Woolwich (the peat of the Thames alluvium 

 probably belongs to the Bronze Age, but it is certainly pre-Roman), 

 P. confusa has been found in the Pleistocene beds at West Wittering,^ 

 in Sussex, and at Stone, '^ in Hampshire. Examples from both these 

 localities are preserved in the Museum of Practical Geology. The 

 specimens from the peat we have been unable to trace. 



1 C. Eeid: Quart. Journ. Geol. Soc, vol. xlviii (1892), p. 357. 



2 C. Eeid: op. cit., vol. xlix (1893), p. 329. 



