688 GEOLOGY OF THE YELLOWSTONE NATIONAL PARK. 



Hill above Lost Creek, bed No. 4; Crescent Hill, 6 feet below Platanus 

 bed; Yellowstone River nearly opposite Hellroaring Creek; collected by 

 Ward and Knowlton, 1887, 1888. 



JUGLANS SCHIMPERI Lx. 



Juglans schimperi Lx. : Tert. Fl., p. 287, PI. LVI, figs. 5-10. 



The collection contains a number of well-preserved examples that 

 seem without doubt to belong to this species. The type is described by 

 Lesquereux as having the margins slightly undulate. The Park specimens 

 are slightly undulate, and also very slightly toothed. The nervation is 

 absolutely the same in both. 



Habitat: Andesitic breccia near gulch northwest of peak west of 

 Dunraven; collected by Joseph P. Iddings, September 12, 1883. 



Juglans laurifolia n. sp. 

 PI. LXXXIII, figs. 2, 3. 



Leaves large, membranaceous, lanceolate or ovate-lanceolate, slightly 

 unequal-sided, narrowed to a wedge-shaped base and rounded to an 

 acuminate apex, margins remotely and slightly denticulate; midrib thick 

 below, becoming much thinner in the upper part; secondaries about 10 

 pairs, thin, alternate, emerging at an angle of 45° or 50°, camptodrome, 

 much curving, ascending near the margin for some distance, where they 

 arch by numerous loops; intermediate secondaries occasional; nervilles 

 very irregular, much branched; finer nervation forming irregularly quad- 

 rangular areola?. 



This species is represented by a number of Avell-preserved leaves. 

 They are from 9 to 13 cm. long and 3 to 5 cm. wide, and are somewhat 

 unequal-sided, the difference in the width of the sides being about 4 mm. 

 This species is marked by its large size, remotely denticulate margin, and 

 strong nervation. 



Among fossil species, Juglans laurifolia is somewhat related to 

 J. egregia Lx., 1 from the Auriferous gravels of California. The leaves of 

 the latter species differ, however, in being obovate-lanceolate, with the broad- 

 est part above the middle, and in having quite numerous, fine, sharp teeth. 



1 Mem. Mus. Comp. Zool., Vol. VI, p. 36, PI. IX, fig. 12. 



