276 u:njted states geological sdevey—tertiaey floea. 



Habitat. — Carbon, Wyoming; in the clay-shale, l)oth above and below 

 the main coal; abundant. Prof. F. B. Meek sent specimens also from flie 

 same locality. All the leaves are equilateral at the base; those of the small 

 size, like fig. 13, are more frequent. 



Z i z y p El u s Ii y p c r b o r e II s ! , Heer. 



Plato LI, Fig. 15. 



Zhyphus hi/perhoreiis?, Heer, Fl. Arct., i, p. 103, pi. xlix, fig. 2 ; ii, p. 482, pi. 1, fig. 20. — Lesijx., Annual 

 Ueport, 1872, p. 389. 



Leaves ovate-lanceolat», acuminate, three- or flve-nerved ; borders undulato-crenate. 



Though the form of the leaves is like that of fig. 20 of Heer, I am not 

 certain of an identity with the Greenland species, which has the primary 

 nerves rather in five than in three, and the outside branches less numerous 

 and more oblique. The fragments figured by Prof Heer are incomplete. 

 He remarks, however (p. 482, loc. ciL), that he has seen, in Mr. Whymper's 

 collection, a large and better preserved leaf, elliptical, acuminate, and 

 toothed. All the varieties of shape and of denticulation are marked in 

 the former species, of which, as just said, this leaf may be a variety. 



Habitat. — Carbon, Wyoming. Other fragments as large as this show 

 the borders more distinctly crenate. 



ZizypliHS f ibi'i I losiis, Lesqx. 



Plate Lll, Figs. 1-G 

 danolhus fibriUosus, Lesqx., Annual Report, 1872, p. 381; 1873, p. 404. — Schp., Pal. Vegdt.,iii, p. 612. 



Leaves rather coriaceous, very entire, ovate-acuminate, rounded or cordate to the base, three- to 

 five-nerved; inner primary nerves subacrodrome. 



These leaves, by their multiplied basilar nervation, are rather referable 

 to Zizyphus than to Ccanothus; for the primary nerves are of the same dis- 

 tribution as in the former species, and tlie shape of the leaves also is about 

 the same. It is, however, variable, the base being merely rounded, as in figs. 

 1, 3, 4, or cordate, as in fig. 2, or tapering to a long acumen, as in fig. 6, 

 which shows the inner lateral nerves aerodrome. The nervation is appar- 

 ently trifid from a little above the base of the leaves, as seen in fig. 3; the 

 lower lateral veins being there merely marginal, joined to the midrib lower 

 than the base of the primary ones, and these being divided into two branches, 

 of which the inner one only is primary (figs. 1, 3). The uervilles are very 

 close, distinct, simple, in right angle to the midrib, oblique to the lateral 

 nerves and their branches. No trace of areolation is discernible. 



Habitat. — Golden, Colorado, and Black Buttes, Wyoming; rare. 



