65 



Quercus hexagona, Lesqx., American Journal of Science and Arts, (!) xlvi, 

 1868, p. 95. 



A mere fragment of a coriaceous or thickish leaf, whose form, as indicated 

 by the preserved part, is rhomboidal or hexagonal, with the sides parallel in 

 the middle, obliquely tapering to a point, and narrowed to the base. The 

 borders, undulate and entire from the middle downward, are cut above and 

 to the point by irregular teeth more or less distant ; the secondary or lateral 

 veins, 7 pairs, are alternate, diverging only 30°, all simple and simply craspe- 

 dodrome, running to the point of the teeth. No details of areolation are rec- 

 ognizable. This leaf is in appearance, for the form at least, like that, Fig. 5 

 of the same plate, which is referred to a Betula. There is, however, a marked 

 difference in the consistence of the leaves, in the lateral veins thicker and 

 simpler in this species, a character not in concordance with the nervation of 

 Betula. The relation, however, of this fragment to Quercus is not positive. 



Habitat. — Cass County, Platte River, Nebraska, Hayden. The frag- 

 ment figured is the only specimen found. 



Quercus (?) ellswoethianus, Lesqx., PL vi, Fig. 7. 



Leaf subcoriaeeous, oblong-oval, pointed (?), rounded and narrowed to the base ; borders undulate ; 

 nervation pinnate, camptodrome. 



Quercus ettsivorthianus, Lesqx., American Journal of Science and Arts, (?) 

 xlvi, 1868, p. 96. 



A fragment only of an oblong oval leaf of medium size, 4 centimeters 

 broad, 9 centimeters long, narrowed by an outward curve to the base, (point 

 broken,) with borders deeply undulate, and a pinnate nervation ; lateral veins 

 numerous, simple or forking near their point, slightly turning downward to 

 the medial nerve, which they join in a broad angle of 50 to 60°. I have 

 compared this leaf to some forms of Quercus lyell'i, Heer, (Flora of Bovey-Tra- 

 cey, p. 1058.) It is, indeed, like the fragment of leaves figured, PI. lxiii, 

 Figs. 5-6 of this work, not in the form and size of the leaves merely, but 

 also in the nervation ; in Fig. 5 some of the veins fork in the same way,, and 

 in Fig. 6 the angle of divergence is the same. This affinity has forced the 

 reference of this Cretaceous fragment to Quercus. Some of the lateral veins 

 are shorter, or abruptly disappearing, and this, too, is remarked upon the 

 specimens of Q. lyelli, figured by Heer. 



Habitat. — Near Decatur, Nebraska, Hayden. A single specimen. 



9 L 



