702 GEOLOGY OF THE YELLOWSTOXE NATIONAL PARK. 



they are uiiitbrnily alternate instead of opposite. Tlie 2 leaves iigured 

 by Heer I re.yard as very doubtful. From their general facies they are 

 much more likelv to belong to Fagus than to Castanea. The other leaf 

 fio-ured with them' does not appear to be the same, tnid is proba))ly a Cas- 

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

 same beds with 2 si)eeies of Fagus, from wliicli they are hardly to be 



separated. 



Habitat: Bluff on Yellowstone River 1 luile Itelow mouth of Elk Creek, 

 and about same distance above mouth of Hellroaring Creek; collected Ijy 

 F. H. Knowlton, August 4, 1888. 



Castaxea pulchella n. sp. 

 PL LXXXVL tigs. 6-8; PI. LXXXVII, ligs. 1-3. 

 QHtrcus drijmijii Uug. Lesciuereux: Cret. and Tert. Fl., p. I'-l'), PI. LIV, tig-. 4. 



Leaves of very thick, tirm texture; long -lanceolate in (uuline, with 

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

 reo-ularly toothed; teeth large and sharp, separated by jjrominent sinuses, 

 or more obtuse with sliallower siiuises; 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, 

 nearlv all in excellent state of preservation. They range in size from al)out 

 8 to 20 cm. in leuiith and from 2 to 6 cm. in widtli, while the jjetiole in some 

 cases is 3.5 cm. long and i-ather 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 Pk LXXXVII, being very large and sharj), while in others they are 

 less prominent. They ;u-e, however, all sharp and ujjward })oiuting. The 

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

 nervation is well preserved, the nervilles being numerous and mainly 

 bi'oken in crossing. 



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

 science. " At first the^" were thought to be the same as the lea\es from 



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



