94 L. Lesquereux on fossil plants from Nebraska. 
10. Populites elegans, sp. nov.—This species has large 
leaves than the former, and also differs from it by its strong, 
slightly ‘undulate, more divided secondary nerves, and by it 
more elongated base and long petiole. The number of the 
secondary nerves and their angle of divergence are the same. 
11 ites ovata, sp. nov.—Leaves ovate in outline, with | 
an obtuse or truncate point ; borders undulate, enlarging t | 
ward the base and abruptly curved to a pretty long slende 
petiole. The primary nerves are in three or five; the s& 
ondary ones are thin, alternate, distant, few in number, will 
an angle of divergence of 30°. The ultimate reticulation de- : 
_ Tived from pretty large square subcontinuous areas is polyg> . 
- nal and small, like that of a Platanus. : 
12. Populites quadrangularis, sp. nov.—This leaf is about 
quadrangular in outline, with obtuse angles and convex » 
ders ; the upper part undulate, the lower entire. The pe 
and medial nerve are slender, the primary nerves in five, the 
lowest pair at a short distance from the upper, the secondary 
nerves numerous, six on each side, running parallel and sligh¥) 
arched to the borders. The substance of the leaves is pretty 
thick. The lowest primary nerves, shorter and more slendet, 
run along the borders as in us. Jeat 
13. Populites flabellata, sp. nov.—A round fan-shaped “a 
oe 
from above the base of the leaf, are distinct but narrow ; the 
15. Salix proteefolia, sp. nov.—Except that the leaves 4 
smooth or polished, apparently thick and coriaceous, this SP 
u ali: . Br., that no different? 
can be pointed out in these forms. The leaves are lanceolate 
or linear-lanceolate, merely pointed or tapering upward into a 
