DESCRirXlON OF SPECIES— OLEACE^. 229 



the teeth of the borders are rather obtuse and distant. The leaves from the 

 Baltic Tertiary are narrower. The broad base of fig. 2 shows the leaf to 

 be sessile. 



Habitat. — The fragment represented by fig. 1 is from Evanston, "Wyom- 

 ing; that represented by fig. 2 from six miles above Spring Canon, Montana 

 {Dr. A. a Peak). 



Fraxinus praedicta, Heer. 



Plate XL, Fig. 3. 



Fraxinus prasdicta, Heer, Fl.Tert. Helv., iii, p. 22, pi. civ, figs. 12, 13; Mioc. Bait. Fl., p. 89, pi. xxiv, fig. 

 24. — Lesqx., Annual Report, 1873, p. 414. 



Leaf small, lanceolate and acuminate upward, narrowed to tbe base, distantly irregularly dentic- 

 ulate; secondary nerves camptodrome, jointd to the teeth by nervilles. 



The fragment represents a small leaf about four centimet^s long, twelve 

 millimeters broad, with a coarse irregular nervation, very similar to that of 

 fig. 13 b of Heer's {loc. cit.). The only differenc? in the characters of this 

 leaf is its more attenuated base, more narrowly cuneate than in any of the 

 leaves figured by the author. I consider it, however, as representing the 

 same species. 



Habitat. — South Park, near Castello's Ranch^ Colorado (Dr. F. V. 

 Hayden). 



Though the two new species mentioned above are not figured here, I 

 give a short description of those fine leaves. 



Fraxinus Eoccuica, sp. nov. 



Leaves of large size, subcoriaceous, distantly obtusely dentate or merely undulate on the borders, 

 broadly lanceolate, rounded in narrowing to the inequilateral base; nervation subcamptodrome. 



The largest of these leaves is about fifteen centimeters long (the point 

 is broken), and five centimeters broad below the middle, where it is the 

 widest; the other leaves are somewhat smaller, exactly of the same form. 

 The secondary nerves, on an open angle of divergence, nearly parallel and 

 equidistant, generally curve in passing toward the borders, where they form, 

 close to them, a series of simple bows, from which emerge the nervilles, which 

 enter the blunt distant teetli. A few of these secondary nerves, however, 

 curve and enter the point of the teeth ; they have generally also a few branches 

 in the upper part. The nervilles are distinct, irregular in direction, much 

 divided; the areolation, as far as it is discernible, is in irregularly polygonal 

 meshes. The base of the leaf is cuneate on one side, descending lower, and 

 rounded on the other, or rounded on both sides, which then are nearly equal; 



