690 GEOLOGY OF THE YELLOWSTONE NATIONAL PARK. 



Among described forms this has some resemblance in shape to 

 J. schimperi Lx./from the Green River group of Colorado, but differs mark- 

 edly in the forking of the secondaries. It is undoubtedly very close to 

 J. acuminata Heer, 2 which in turn is hardly to be distinguished from the 

 J. rugosa of Lesquereux. Additional material of all these will be necessary 

 to settle the status of each. 



Habitat: Northeast side of Crescent Hill; collected by F. H. Knowl- 

 ton and G. E. Culver, August 2, 1888. Fossil Forest, bed No. 6; collected 

 by Ward and Knowlton August, 1887. 



Hicoria antiquorum (Newby.) Kn. 



Hicoria antiquorum (Newby.) Kn.: Bull. U. S. Geol. Surv. No. 152, p. 117, 189S. 

 Carya antiquorum Newby.: Later Extiuct Floras, p. 72; 111. Cret. and Tert. Plants, 

 PI. XXIII, figs. 1-1. Lesquereux: Tert. Fl., p. 289, PL LVII, figs. 1-5. 



The collection contains a number of somewhat fragmentary specimens, 

 but the characteristic teeth and nervation suffice to enable their certain 

 reference to this species. 



Habitat: Fossil Forest Ridge, bed No. 5, "Platanus bed;" collected by 

 Ward and Knowlton, August, 1887. 



Hicoria crescentia n. sp. 

 PI. LXXXIY, fig. 7. 



Leaflet thick and firm, elliptical-lanceolate, inequilateral ; rather long 

 wedge-shaped at base and apparently narrowed above to an acuminate 

 apex; margin serrate, teeth small, sharp; midrib rather thick, straight; 

 secondaries about 15 pairs, alternate, irregular, at obtuse angles, arching 

 upward, rarely forked, craspedodrome, or subcraspedodrome, either arching 

 near the margin and sending branches to the teeth, or dividing- and sending 

 weaker terminations into the teeth; intermediate secondaries occasional, 

 short, and soon disappearing; nervilles numerous, mainly percurrent, approxi- 

 mately at right angles to the secondaries; finer nervation forming rather 

 large quadrangular areolae. 



The specimen figured is the only one referred to this species, and 

 unfortunately it lacks both base and apex. It is now about 7 cm. long and 



'Tert. FL, p. 287, PI. LVI, figs. 5-10. 

 -EI. Tert, Helv., Vol. Ill, PI. CXXVIII. 



