Former Distribution of British Plants. 1 1 9 

 Pyrus Aria, Sm. 



Preglacial (Cromer Forest-bed) : — 

 Pakefield, Suffolk (leaves). 



Pyrus Aucuparia, Gaert. 

 Neolithic : — 



Caerwys, Flintshire. 



Recorded from the Pine, Oak, and Spruce Zones 



(Neolithic) in Sweden (Gunnar Andersson). 



Pyrus communis, L. 

 Neolithic : — 



Crossness, Essex (upper and lower peats), (wood de- 

 termined by Professor Marshall Ward). 



Crataegus Oxyacantha, L. 



Neolithic : — 



Barry Docks, Glamorgan; Crossness, Essex (upper 

 and lower peats); Redhall, near Edinburgh; Hailes, near 

 Edinburgh ; Gayfield near Edinburgh. 



Interglacial: — 



Southelmham, Suffolk. 



Preglacial (Cromer Forest-bed) : — 



Overstrand, Norfolk. 



In the Swedish peat- mosses only the form Cratcegus 

 monogyna occurs (Gunnar Andersson). 



Saxifraga oppositifolia, L. 



Unknown fossil in Britain. 



Recorded from Deuben, in Saxony (Nathorst), asso- 

 ciated with Salix kerbacea, &c. 



