DESCRIPTION OF SPECIES— MORE^. 205 



figs 1-3). rvidoiilly (lifTcring, however, by its long petiole, and the position of 

 the primjiiT latenil nerves diverging from the top of the petiole at the base 

 of tlie leaves. These are about all of tlie same size, eight to ten centimeters 

 long, and three to four centimeters wide at the middle. The veins and ner- 

 villes are very distinct though thin, the nervilles nearly at right angle to the 

 midrib, crossed by oblique branchlets, result into a large inequilateral or 

 polygonal areolatioii. 



Habitat. — Evanston, Wyoming; Green H'wer grou\) (Dr. F.V.Hat/den). 



Fie IIS Wyouiiiigiiiiia. Lesqx. 



F'liite XXXIV, Fif{. 3. 



Ficus Wyoniingiana, Lesqx., Annual Report, 1874, p. :U4. 



Leaves of the s.iuio form, size, and conbistence as the former ; i>riniary 'ateral nerves aerodrome; 

 secondary nerves none. 



The fragment figured here has, by the outline of the leaf which it repre- 

 sents, a great likeness to those of the former species, differing merely, it 

 seems, by the absence of secondary nerves, whose place is taken by strong 

 nervilles, inflated toward the midrib. The primary lateral veins curve inside, 

 and ascend apparently to the top of the leaf The areolation is of the same, 

 character. It may be a mere variety. 



Habitat. — Green River group, with the former {Dr. F. V. Hayden). 



Ficus s II b t r II It c a t a , Lesqx. 



Plate XXX, Fifjp. ~-9. 



Ficug trinicataf, Heer, Lesqx., Anuuiil Report, 1873, p. 400. 



Leaves comparatively small, entire, tiuucato-cordate at the more or less inequilateral hase, ovate 

 or oblong, acuminate ; borders undulate. 



As far as the species is represented by the three leaves figured here, i.t 

 seems truly dilferent from Heer's species as described from one leaf only 

 (Fh Tert. Helv., iii, p. 183, pi. clii, fig. 15). The l)asilar or subbasilar veins 

 are in the Ameiican torm more numerous, two, even ihree, pairs, thin, more 

 distinctly following the borders in simple curves, scarcely branching. The 

 base of the leaves is rather subcordate than truncate, and from fig. 9 the top 

 seems rather acuminate than obtusely pointed. Except the fragment in fig. 

 H, our specimens represent small leaves of a rather thick consistence, a char- 

 acter at variance also with that indicated by Heer, who describes his leaf as 

 membranaceous. Notwithstanding these differences, both forms are closely 

 allied. The areolation, as seen in fig. 7, is large and irregularly polygonal. 



