knowlton.] DESCRIPTION OF SPECIES. 47 
This leaf is entirely different from any heretofore reported from the 
A merican Cretaceous. It is remotely suggestive of F. latifolia in shape, 
but differs in being lobed or toothed, and in having secondaries al 
right augles to the midrib, as well as in the finer nervation. It may 
not even belong to the genus Ficus. It is, for example, somewhat like 
Dombeyopsis islandica Heer, 1 I), obtusa Lx., 2 Sterculia variabilis Beer, 3 
etc., yet is not close enough to warrant putting it in any of these genera. 
Habitat. — Point of Kocks, Wyoming, north of station and midway of 
cliff. Collected by Lester F. Ward, September 3, 1881. 
Ficus rhamnoides n. sp. 
PI. X, figs. 1-3 ; PI. XI, fig. 1 . 
Leaves thickish, oblong-lanceolate in outline, about equally narrowed 
to base and apex; margin perfectly entire; petiole thick; midrid thick- 
ish, straight; secondaries about 12 pairs, alternate, at an angle of 
45° to 50°, eamptodrome, arching just inside the margin and joining the 
one next above; nervilles very numerous, at right angles to the second- 
aries, mainly broken, although, many are percurrent. 
These leaves are from 9 to 11 cm. long and from 3.5 to 5 cm. broad. 
The secondaries are at an angle of about 45°, and eamptodrome by 
means of a few small, simple loops. 
At first sight these leaves appear to be referable to Rhamnus Cleburni 
Lx., 4 a species very abundant in the Denver beds at Golden, Colorado. 
They have exactly the same size, shape, and arrangement, the main 
difference being in the nervilles. In Rhamnus Cleburni they are very 
fine and close together, mainly percurrent, and in general at right 
angles to the midrib, while in Ficus rhamnoides they are coarser, mainly 
broken, and at right angles to the secondaries. These are characters 
hardly sufficient for generic separation were it not for the fact that it 
is more than probable that the Rhamnus Cleburni and R. goldianus of 
Lesquereux really belong to the genus Ficus. Lesquereux says 5 that 
the European authors, presumably JSaporta and Heer, to whom he had 
submitted specimens, were inclined to regard them as belonging to the 
I rticaceae. They have also some resemblance to Coruus. 
It is with regret that I am obliged to describe this as a supposed 
new species of Ficus, but if they belong to this genus they are certainly 
new, at least in this flora. It is to be hoped that specimens will some 
time be found that will settle more elearly the proper generic position 
ot these interesting leaves. 
Habitat. — Point of Rocks, Wyoming, north of station and midway 
ot* cliff. Collected by Lester F. Ward, September 3, 1881. 
'Fl. Foss. Arct., Vol. I, PI. XXVII, fig. 10 (1868). 
2 Tert. Fl., p. 255, PL XLVII, fig. 5 (1878). 
3 F1. Foss. Arct., Vol. VII, PI. LVII, fig. 7 (1884). 
4 Tert. FL, p. 280, PI. LIII, figs. 1-3 (1878). 
6 Ibid., p. 280. 
