Former Distribution of British Plants. 159 



Early Glacial : — 



Beeston, Norfolk (base of Arctic Freshwater Bed). 

 Preglacial (Cromer Forest-bed) : — 



Abundant nearly everywhere. 



Zannichellia pedunculata, Reichb. 

 Interglacial : — 



West Wittering, Sussex. 



Preglacial (Cromer Forest-bed) : — 



Sidestrand, Norfolk ; Pakefield, Suffolk. 



At Pakefield a remarkable spinose form of drupelet 

 occurs. 



ZOSTERA MARINA, L. 



Not certainly known fossil in Britain, though Zostera- 

 like foliage occurs in estuarine deposits. 



Recorded with doubt by Gunnar Andersson from South 

 Sweden and Gotland. 



Najas flexilis, Rostkov. 



Unknown fossil in Britain. 



Recorded from Gotland, and from the^^^^/z/.y-formation 

 (Pine Zone) in Sweden (Gunnar Andersson) ; also from 

 Honerdingen, Hanover, and Griinenthal, Holstein, in Inter- 

 glacial deposits (C. Weber). 



This plant in Europe is only known living in the West 

 of Ireland, Scotland, South Sweden, and Gotland. 



Najas marina, L. 

 Neolithic : — 



Barry Docks, Glamorgan. 



Interglacial : — 



Hitchin. Hertfordshire. 



