DESCRIPTION OF SPECIES— MOKE.52. 193 



tired in our jilate; the essential cliaractcrs, howi'vcr, the lanceolote form, the; 

 long tapering hase, tlic thick petioh-, and the nervation, arc distinct!}- recog- 

 nized npon tlie specimens. The subslanre is thick, rather coriaceous; tlie 

 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, whose fig. 3 compares also in every point to fig. 13, pi. clii, 

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

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

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

 of cnrves. 'Its thick midiib refers it to a iVcws, and its narrowed base to this 

 species. It is from a different locality, and the only fragment which I had 

 for identification. 



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

 oming, with Populus arctica and Cyperus Chavanenais (Dr. F. V. Hin/den); 

 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). 



Ficus Jyiix, Ung. 

 Plate XXVIII, Fig. G. 



i'lc'iis Jtjnx, Uog., Fl. V. Sotzka, p. 16,5, pi. xxxiii, fig. 3.— Ett., Tert. Fl. v. Hiir., p. 41, pi. x, figw. 



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



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

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



Leaves coriaceous, lanceolate, narrowed to the petiole; secondary nerves .it 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 Rhamnus than to Ficus. 



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



13 T F 



