702 GEOLOGY OF THE YELLOWSTONE NATIONAL PARK. 



they are uniformly alternate instead of opposite. The 2 leaves figured 

 by Heer I regard as very doubtful. From their general fades they are 

 much more likely to belong to Fagus than to Gastanea. The other leaf 

 figured with them 1 does not appear to be the same, and is probably a Cas- 

 tanea, although somewhat anomalous. They are found associated in the 

 same beds with 2 species of Fagus, from which they are hardly to be 

 separated. 



Habitat: Bluff on Yellowstone River 1 mile below mouth of Elk Creek, 

 and about same distance above mouth of Hellroarmg Creek; collected by 

 F. H. Knowlton, August 4, 1888. 



Castanea pulchella n. sp. 

 PI. LXXXYI, figs. 6-S; PI. LXXXYII, tigs. 1-3. 

 Quercus drymeja Ung. Lesquereux: (Jret. and Tert. EL, p. 1'Lj, PI. LIV, fig. 4. 



Leaves of very thick, firm texture; long-lanceolate in outline, with 

 wedge-shaped base and long, slender, acuminate apex; margin evenly and 

 regularly toothed; teeth large and sharp, separated by prominent sinuses, 

 or more obtuse with shallower sinuses ; petiole long, slender; midrib strong, 

 straight; secondaries very numerous, opposite or alternate, parallel, all, 

 except two or three of the lowest, entering the teeth; nervilles well pre- 

 served, numerous, at right angles to the secondaries, mainly broken. 



This fine species is represented by a very large series of specimens, 

 nearly all in excellent state of preservation. They range in size from about 

 8 to 20 cm. in length and from 2 to 6 cm. in width, while the petiole in some 

 cases is 3.5 cm. long and rather slender. They are lanceolate in outline, 

 with a long wedge-shaped base, which is without teeth for some distance, 

 and a very long slender apex provided with numerous strong teeth. The 

 teeth of the margin are numerous and regular, in some cases, as in fig. 2 

 of PL LXXXVII, being very large and sharp, while in others they are 

 less prominent. They are, however, all sharp and upward pointing. The 

 secondaries are numerous, parallel, and entering the teeth. The finer 

 nervation is well preserved, the nervilles being numerous and mainly 

 broken in crossing. 



It is with some hesitation that these leaves are described as new to 

 science. At first thev were thought to be the same as the leaves from 



'Loo. cit., PI. VII, tig. 3. 



