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 \hz Ancylus-ioKXtidXxoxx 

 (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. 



