142 Origin of the British Flora. 



Euphorbia amygdaloides, L. 



Preglacial (Cromer Forest-bed) : — 



Mundesley, Norfolk ; Pakefield, Suffolk. 



Mercurialis perennis, L. 

 Neolithic: — 



Crossness, Essex (upper and lower peats) ; Hailes, near 

 Edinburgh; Fillyside, near Edinburgh (raised beach). 



Interglacial: — 



West Wittering, Sussex. 



UlMUS MONTANA, Sm. 



Blashenwell, Dorset ; Dursley, Gloucester (in calcareous 

 tufa of doubtful age); Digby Fen (elm-wood recorded by 

 Skertchly from a depth of lO feet). 



Interglacial: — 



Grays, Essex (badly preserved leaves). 



Preglacial (Cromer Forest-bed) : — 

 Happisburgh, Norfolk. 



In each case the leaves are small, and more like 

 U. montana than like U. campestris. The difference in 

 the leaves is very slight, and I have not yet been able 

 to obtain the more characteristic fruit. 



Urtica dioica, L. 

 Late Glacial : — 



Hoxne, Suffolk (bed C) (one seed, perhaps derived from 

 the bed below). 



Interglacial : — 



Hoxne, Suffolk (bed D;. 



