DESCRIPTIONS OF SPECIES. 41 



Populus cuneata Newb. 



PI. XXVIII, figs. 2-4 ; XXIX, fig. 7. 

 Ann. N.Y. Lye. Nat. Hist., Vol. IX (April, 1868), p. 64 ■ His. Cret. and Tert, PI. (1878), 

 PI. XIII, figs. 2-4, under P. nervosa var. ; and PI. XIV, fig. 7, under P. 

 Nebrascencis. 



"Leaves small, obovate, somewhat wedge-shaped at the base, obtusely 

 pointed at the summit, coarsely, obtusely, aud irregularly dentate on the 

 margins, three-veined, basilar nerves given off at an acute angle, terminating 

 above the middle of the margin; secondary nerves few-forked, and often 

 inosculating." 



This species is represented by numerous specimens in the collection 

 made by Dr. Hayden. It will be seen to be distinctly separable from any 

 of the species published with it, and the same may be said in regard to 

 those published elsewhere. In general form it bears some resemblance to 

 P. attenuata, Al. Braun (Heer, Fl. Tert. Helv, Vol. II, p. 15, PL L VII, 

 figs. 8-12, and PL LVIII, figs. 1-4); also to some forms of P. mutabilis% 

 Heer; but the nervation is less crowded than in those species, and both are 

 acuminate-pointed. An elongated form is shown on PL XXIX, fig. 7. 



Formation and locality : Tertiary (Eocene?). Banks of Yellowstone 

 River, Montana. 



Populus cyclophylla Heer. 



PI. Ill, figs. 3, 4; IV, fig. 1. 



Proc. Phila. Acad. Nat. Sci., 1858, p. 266. Lesq., Ills. Cret. and Tert. PI. (1878), 



PI. Ill, figs. 3, 4; PI. IV, fig. 1, under P. UUgiosa Heer. 

 Populites cyclophylla {Populus) Heer. Lesq., Am. Journ. Sci., Vol. XLVI (July, 



186S), p. 93. 

 Populites cyclophylla (Heer)? Lesq., Cret. Fl. (1874), p. 59, PI. IV, fig. 5; PI. XXIV 



fig. 4. 



The specimens upon which Heer founded his species are given on 

 PL III, and are before me as I write. The smaller specimen represented 

 by fig. 3 is characteristic and normal, except that it is not more than half the 

 average size of the leaves of this species. Fig. 4 is but a fragment, aud 

 it is very doubtful whether it should be considered as belonging to P. cyclo- 

 phylla. The leaf figured on PL IV is about of the average size, and though 

 incomplete, may be accepted as a fair representative of the species. Such 

 leaves are not uncommon in the Dakota group at Fort Harker, and a 



