DESCRIPTION OF SPECIES— MORE^. 193 



ured in our plate; the essential characters, however, the lanceolote form, the 

 long tapering base, the thick petiole, and the nervation, are distinctly recog- 

 nized upon the specimens. The substance is thick, rather coriaceous; the 

 distance between the lateral nerves variable, and the areolation of the same 

 type as in fig. 1, pi. xxii, of the Mioc. Bait. Flora, a leaf of the same size as 

 those of our plate, who.se fig. 3 compares also in every point to fig. 13, pi. clii, 

 of the Fl. Tert. Helvet. Our fig. f), however, does not closely agree in its 

 characters with those of this species. The secondary nerves are too close 

 and equidistant, reaching to near the borders, and following them in a series 

 of curves. Its thick midrib refers it to a Ficus, and its narrowed base to this 

 species. It is from a different locality, and the onl}' fragment which I had 

 for identification. 



Habitat. — The leaves in figs. 1-3 are from the Green River group, Wy- 

 oming, with Populus arctica and Cyperus Chavanensis {Dr. F. V. Hayden); 

 fig. 4 is from a specimen from Willow Creek, Middle Park, Colorado {Dr. 

 W. H. Holmes); and fig. 5 from Florissant, near South Park, Colorado {Prof. 



E. D. Cope). 



Fie us Jynx, Ung. 



Plate XXVIII, Fig. 0. 



Ficua Ji/nx, Ung., Fl. v. Sotzka, p. 165, pi. xsxiii, fig. 3. — Ett., Tert. Fl. v. Hiir., p. 41, pi. x, figs. 



6-8 ; Fobs. Fl. v. Bil., p. 69, pi. xx, figs. 2-7.— Heer, Fl. Tert. Helv., ii, p. 63, pi. Ixxxv, figs. 



8-11. — Lesqx., Annual Report, 1873, p. 414. 

 Ehamnus Eridani, Ung., Foss. Fl. v. Sotzka., p. 178, pi. lii, figs. 4-6 (Ade Ett.). 



Leaves coriaceous, lanceolate, narrowed to the petiole; secondary nerves at an open angle of 

 divergence, close, parallel, simple, straight to the borders, where they abruptly curve along them. 



The leaves of this species, as represented by Heer and Unger {loc. cit.), 

 are larger than the fragment figured here, and generally broadly oval and 

 obtuse. Fig. 7, however, of the Bilin Flora is similar to ours in every point. 

 The German author refers to this same species three leaves of the Sotzka 

 Flora (figs. 4-6, pi. lii), which also closely resemble ours, especially fig. 6. 

 The identity, however, is not absolutely ascertained on account of the frag- 

 mentary state of our leaf, whose petiole is broken and its upper part destroyed. 

 The direction of the secondary veins, at the same angle of divergence as in 

 the European form, and abruptly curving in touching the apparently reflexed 

 borders, relate this leaf rather to Rliamnus than to Ficus. 



Habitat. — Elko Station, Nevada {Prof. E. D. Cope). 



13 T F 



