FOSSIL FLORA. 753 



Habitat : Yellowstone River, one-half mile below the month of Elk 

 Creek, base of bluff; collected by F. H. Knowlton, August, 1888. 



0LEACE2G. 



FrAXINUS WRIOHTII 11. Sp. 

 PI. XC, fig. 4. 



Leaflet small, membranaceous in texture, oblong in outline, unequal- 

 sided, wedge-shaped at base, obtuse at apex; margin with few irregular 

 scarcely pointed teeth; midrib strong, slightly flexuose; secondaries about 

 7 pairs, alternate, at various angles, flexuose, camptodrome or subcras- 

 pedodrome, mostly arching and joining by bows some distance inside the 

 margin, sometimes entering the teeth, and usually with outside branches 

 to the minute, often obtuse, teeth; nervilles numerous, irregular, all forked 

 or broken; finer nervation producing irregular quadrangular meshes. 



The specimen figured, which was the only one found, is 4 cm. long 

 and 2.2 cm. wide. It is decidedly inequilateral, with a wedge-shaped base, 

 and undulate-toothed margin. The nervation is camptodrome, with the 

 secondaries arched and joined by broad bows well inside the margin, or 

 occasionally with a secondary entering a tooth, thus becoming' craspedo- 

 drome. The finer nervation is beautifully preserved, producing' very 

 irregularly quadrangular meshes 



The relation of this species is undoubtedly with Fraxinus heerii Lx., 1 

 from Florissant, Colorado. Lesquereux's species differs in being much 

 larger and narrower, with merely undulate margin. The nervation is 

 strictly camptodrome, but otherwise identical. 



I have named the species in honor of Mr. George M. Wright, by whom 

 it was collected. 



Habitat: Yellowstone River, below Elk Creek, top of bluff; collected 

 by George M. Wright, September 9, 1885. 



Phyllites crassifolia n. sp. 

 PI. Oil, fig. 5; PI. CIII, fig. 1. 



Leaves very large, thick, apparently rudely oval or orbicular in out- 

 line; base rounded or slightly heart-shaped, upper portion rounded (?); margin 



' Cret. ami Tert. PI., p. 169, PI. XXXIII, figs. 5. 6. 

 MON XXXII, PT II 48 



