194 Reid. — Notes on the Geological History 
Salix cinerea, Linn. 
Leaves. Bovey Tracey, Devonshire (Heer and Nathorst). 
Preglacial (Cromer-Forest bed), (Nathorst). 
Salix repens, Linn. 
Leaves. Postglacial, Barnwell. A number of leaves 
in the Woodwardian Museum (Cambridge) appear to be cor- 
rectly referred to this species. 
Salix herbacea, Linn. 
Leaves. Interglacial, Hailes. 
Salix polaris, Wahlb. 
Leaves. Below the glacial deposits, Beeston, Mundesley, 
and Ostend in Norfolk (Nathorst and Reid). 
Several other species of Salix have been recorded with 
doubt, but the determination from leaves is very difficult. 
Empetrum nigrum, Linn. 
Compressed berries and stones. Interglacial, Airdrie. 
Ceratophyllum demersum, Linn. 
Fruit. Postglacial, Mundesley. Preglacial (Cromer Forest- 
bed). The preglacial specimens vary much in the length 
of the spurs, but only one has been found entirely without 
them. 
GYMNOSPERMAE. 
Taxus baccata, Linn. 
Wood and seeds. Postglacial in submerged peats, &c. 
of the Fenland ; Albert Docks (Mr. Spurred). Preglacial 
(Cromer Forest-bed) at several localities. 
Pinus sylvestris, Linn. 
Cones, wood, and bark. Postglacial, in submerged peats 
of the Fenland, &c. Interglacial (bark, but no cones), Hailes, 
Redhall, and Cowden Glen. Preglacial (Cromer Forest-bed) 
at many localities (wood and cones). 
