Former Distribution of British Plants. 157 



Late Glacial : — 



Hoxne, Suffolk fbed C) ; Ballaugh, Isle of Man (bed D). 



Interglacial : — 



Endsleigh Street, London ; Hitchin, Hertfordshire ; 

 Southelmham, Suffolk. 



Preglacial (Cromer Forest-bed) : — 



Beeston, Sidestrand,Trimingham,Mundesley, in Norfolk. 



POTOMAGETON DENSUS, L. 

 Interglacial : — 



West Wittering, Sussex. 



POTAMOGETON OBTUSIFOLIUS, Mert. & Koch. 

 Interglacial : — 



Endsleigh Street, London; Southelmham, Suffolk. 



POTAMOGETON PUSILLUS, L. 

 Neolithic : — 



Hailes, near Edinburgh ; Redhall, near Edinburgh ; 

 Cowden Glen, Renfrewshire. 



Late Glacial : — 



Hoxne, Suffolk (bed C). 



Interglacial : — 



Hoxne, Suffolk (bed D). 



POTAMOGETON TRICHOIDES, Cham. 

 Late Glacial: — 



Hoxne, Suffolk (bed C). 



Interglacial : — 



West Wittering, Sussex ; Stone, Hampshire; Southelm^ 

 ham. Suffolk ; Hoxne, Suffolk (beds D and E). 



