Former Distribution of British Plants. 117 
Late Glacial :— 
Roxburgh Street, Greenock (?). 
Interglacial:— 
Endsleigh Street, London; West Wittering, Sussex. 
POTENTILLA COMARUM, Nestl. 
Neolithic :— 
Redhill, near Edinburgh; Hailes, near Edinburgh. 
Late Glacial :— 
Kirk Michael, Isle of Man; Close y Garey, Isle of 
Man. 
Interglacial :— 
Airdrie, Lanarkshire. 
ALCHEMILLA ARVENSIS, Lam. 
Roman Period :— 
Silchester, Hampshire. 
Neolithic:— 
Redhall, near Edinburgh. 
Interglacial :— 
West Wittering, Sussex. 
As only a single achene has been sent to me from 
Redhall, this may possibly be a recent specimen acci- 
dentally introduced. At West Wittering achenes are 
fairly common. 
POTERIUM OFFICINALE, Hook, 
Neolithic :— 
Redhall, near Edinburgh; Cowden Glen, Renfrewshire. 
