96 L, Lesquereux on fossil plants from Nebraska. 
are marked by a few strong pointed teeth. Downward 1 
are slightly enlarged just above the base, and hence are 
uated to the petiole, giving thus an hexagonal form to the 
The secondary nerves, seven on each side, slightly curve in 
cending each to the point of a tooth. ot 
20. Quercus Ellsworthianus, sp. nov.—A leaf somewhil | 
like the following, resembling Quercus Lyellit Heer, by 8) 
oblong oval form and undulate borders; the point is 7 
stroyed ; the base is narrowed to the petiole. The substait | 
of the leaf is thin and the secondary nerves very slender, call | 
todrome, sometimes branching near the borders. a8 
21 cus anceps, sp. nov.—Allied like the former | 
Quercus Lyellii Heer. Leaves coriaceous, ovate-lancedlata i 
pointed, or short-acuminate, attenuated to the base, with 1] | 
entire, not undulate borders, Secondary nerves, strong, 
todrome, curving near and along the borders ; veinlets 
dicular, nearly continuous, mostly branching. The base 0 
leaf is destroyed. Fe 
ercus semi-alatus, sp. nov.—The leaves of this species 
4 
ous length, craspedodrome and camptodrome, diver, unde 
various angles, with the iatlegiation of a Platanus. PT be sib 
stance of the leaves is pretty thick. : 
23. Ficus ou 
: y We 
to the top, having therefore a broadly rhomboidal form. 
in a Populus affinity of this leaf is still uncertain. 
24, é : us, sp. nov.—This leaf, of which a fee 
mer. K 
its whole upper border is surrounded by regular, erect tech | 
inflated or dilated at the point as if se small leafy om 
sions, and separated by broad obtuse sinuses. The petiole ¥ 
