DE. HEEE ON THE FOSSIL FLOEA OF BOVEY TEACEY. 
1081 
From the midrib spring shortened secondary nerves, which are united with each lower 
secondary nerve, a character peculiar to the leaves of the willows. 
2. Salix, spec. (Plate LXXI. figs. 4 & 5.) 
S. foliis petiolatis, ohlongis, basi rotundatis, integerrimis (1), rugulosis, nervis secunda- 
riis valde cam.ptodromis ner\illisque validis. 
This is doubtless the leaf of a willow, since it has the same characteristic nervation ; 
the base of the leaf is obtusely rounded, and the margin seems to be entire. The spe 
cimen represented in fig. 4 has nearly parallel sides, but the base is obtusely rounded ; 
on the margin no teeth are visible. The secondary nerves are also highly inclined 
towards the apex, and numerous nervules cause the wrinkled appearance of the surface. 
The small leaf which is represented at fig. 5 belongs undoubtedly to the same species 
with the foregoing, although the sides are less parallel. It is very like the leaves of 
Salix amygdalina, Linn., which vary very much in shape ; but the secondary nerves and 
the nervules are strong, and the margin seems to be entire. 
3. Salix eepexs, Linn. 1 (Plate LXXI. figs. 1 c-li, 6 & 7 J.) 
S. foliis bre\iter petiolatis, ovalibus, oblongis et oblongo-lanceolatis, integerrimis, 
nervis secundariis valde curvatis. 
The most frequent leaf of the white clays. Numerous fragments lie confused in all 
directions. 
Some forms are rather similar to those of Salix cinerea, Linn., but the nerves are not 
nearly so strongly developed : the surface of the leaf is much smoother, and the margin 
is not dentate. 
The dimensions and the form of these leaves are very variable. The length varies from 
6 to 45 millims. : some are short, oval, and obtusely rounded at the apex ; others (and they 
are the most numerous) are oblong, and rather obtuse at the apex ; whilst others are 
lanceolate, and have an acuminate apex. There are so many intermediate forms, that 
these cannot be separated. The midrib is rather slender; from it rise the secondary 
nerves at a rather acute angle ; they are highly curved towards the apex, and near the 
margin they are united in arches. The areas are divided by very delicate nervules. 
At some places the shortened secondary nerves, which pass over to the lower secondary 
nerves, are visible, but in most of the leaves this important mark is not quite distinct. 
As to the shape and nervation of the leaves, it seems to me most nearly allied to Salix 
rejyens, Linn. ; but the incui'vate apex is wanting, which, however, does not always exist 
in S. repens. Salix amhigua, Ehrh., and S. amligua, Sendtner (/S', aurito-myrtilloides), 
have very similar leaves. 
2. Betula, Linn. 
4. Betula xana, Linn. (Plate LXXI. figs. ITc a.) 
B. foliis parvulis, orbiculatis, profimde crenatis, nervis secundariis fiexuosis, craspedo- 
dromis, basalibus approximatis, areis nervulis reticulatis. 
7 H 2 
