FOSSIL FLORA. 753 



lTal)itat: Yellowstone River, one-lialt' mile l)elo\v the mouth of Elk 

 Creek, base of l^luff; collected liy F. H. Kiio\\lton, August, 1888. 



OLEACE.E, 



FrAXINU.S WKIGHTII 11. sp. 

 PI. XC, tig. 4. 



Leaflet .small, ineml:)raiiaceous iu texture, oblong- in outline, unequal- 

 sided, wedge-shaped at base, obtuse at apex; maro-in 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 cjuadrangular meshes. 



The specimen fig-ured, which was the only one found, is 4 cm. long 

 and 2.2 cm. wide. It is decidedly inasquilateral, 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 flner nervation is beautifully preserved, producing very 

 irregularly quadrangular meshes 



The relation of this species is undoubtedly with FraxUms heerii Lx.,' 

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

 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 ^I. Wright, by whom 

 it was collected. 



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

 by George M. Wright, September 9, 1885. 



Phvllites ckassifolia 11. sp. 

 ri. Gil, flg. 5; PI. cm, fig. 1. 



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

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



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

 JION XXXII, PT II 48 



