44 FLORA OF THE MONTANA FORMATION. 
This species does not appear to have been since collected with cer- 
tainty until found by Mr. Stanton at Coalville. The collections from 
the coal mine on Coal Creek, Boulder County, Colorado, obtained by 
Lakes in 1890, contain a number of fragments that seem to belong here, 
but they are more or less doubtful. They are similar in shape to F. 
lanceolata, but have more numerous secondaries at a more acute angle 
of divergence. 
The specimens from Coalville, Utah, are fairly well preserved in 
regard to outline, but not so well preserved in regard to nervation. 
Enough can be made out, however, to make it reasonably certain that 
they belong to this species. 
The reference of these same leaves to Ficus irregularis in the Bulle- 
tin of the Geological Society of America, Vol. VIII, page 150, is lapsus 
penna3 for F. multinervis, and the mention in the same place of F. 
lanceolata is not borne out by more careful study. The close, parallel 
nerves are made out with difficulty, but under strong light they are 
ascertained to be present. 
Habitat. — Coalville, Utah. Coal Creek, Boulder County, Colorado.? 
Ficus populoides n. sp. 
PI. VIII, tig. 3. 
Leaf thick, broadly ovate in outline, rounded at base, regularly 
rounded to a short obtuse apex above; margin undulate; palmately 
five nerved from the base; midnerveor midrib somewhat rlexuose, with 
about three alternate pairs of slender secondary branches well above 
the middle of the leaf; lowest pair of nerves smallest, forking, anasto- 
mosing with branches from the second pair, camptodrome; second 
pair strongest, passing to near the apex, dividing the distance between 
the midrib and margin about equally, flexuose above, then there are 
three or four strong branches which arch and anastomose near the 
margin ; nervilles well defined, mainly percurrent. 
The beautiful leaf upon which this species is based is nearly perfect, 
lacking only a portion of the base and one side. It is very broadly 
ovate in outline, being 9.5 cm. in length and 7.75 cm. in width. 
This species is evidently closely allied to F. incompleta (ante p. 46), 
and it is possible that if the latter were preserved entire they might 
be found to be the same. The one described as F. incompleta is a larger 
leaf, but the arrangement of the secondaries in the apex is very similar 
to that in the leaf under discussion. The finer nervation is also 
similar in both, but F. populoides has no lobes. 
There is a general resemblance of this species to F. squarrosa. The 
latter has slight lobes and ditfers somewhat in the number and arrange- 
ment of the secondaries. The finer nervation is also a little different. 
Ficus populoides has at first sight a striking resemblance to certain 
forms of Populus arctica Heer, such, for example, as PI. V, figs. 1, 3, 
and 8, in Heer's Flora Fossilis Arctica, Vol. I, and PI. XXIII, figs. 1 
and 3, in Lesquereux's Tertiary Flora. The size, shape, and general 
