27 
Viburnum finale Ward 
Plate V, figure 4 
V iburnum finale Ward, U.S. Geol. Surv., Sixth Ann. Kept., 1884-85 [1886], 
p. 557, PI. Ixv, fig. 8; U.S. Geol. Surv., Bull. 37, 1887, p. 115, PI. Ivii, 
fig. 5. 
Some of the specimens from the Ravenscrag which I have referred to 
this species are relatively wider and with more ascending secondaries than 
the type, and I have figured one of these. It show's the same slight in- 
equality of the two sides of the lamina, and differences in the distal branch- 
ing of the secondaries on the two sides, exactly as in the type. Associated 
with it are leaves which agree more exactly with Ward’s type, which latter 
came from the Fort Union at Iron Bluff, Glendive, Montana. The speci- 
men from Ravenscrag butte, figured, has the complete petiole, hitherto 
not known. It is stout and 1*5 cm. long. 
(Incertae sedis) 
Genus, Apeibopsis Heer 
Apeibopsis discolor Lesquereux 
Rhamnus discolor Lesquereux, U.S. Geol. and Geog. Surv., Terr., Ann. 
Rept., p. 398, 1872. 
Apeibopsis discolor Lesquereux, Rept. U.S. Geol. Surv,, Terr. (Tertiary 
Flora), vol. 7, p. 259, Pi. 46, figs. 4-7, 1878. 
An original and counterpart represent this species. They are ovate, 
rounded, and slightly cordate at the base, likely to be acutely pointed at 
the apex, and entire; from 5-5 to 7-0 cm. long and about 5-5 cm. in maxi- 
mum width. The venation is pinnate, with rather strong midvein more or 
less wavy in traversing the whole length and much diminishing toward 
the apex; the secondary veins seven or eight on each side, diverging from 
the midvein at angles of from 30 degrees to 90 degrees (the more distal 
the larger the angles), opposite in the lower part and sub-opposite or 
alternate in the upper part, sub-parallel, curving upward, camptodrome, 
branching mostly near the margins but som.e near the midrib; the nervilles 
connecting the secondaries and tertiaries at various angles, some being 
nearly parallel. 
The genus w'as proposed by Heer in 1859 for leaves from the Miocene 
of central Europe which he supposed were related to the existing genus 
Apeiba Aublet, a South American tropical genus of the family Malvaceae. 
The correctness of this identification is supported in the case of some of 
the fossil species by their association with characteristic fossil fruits, but 
this is not the case with any North American species referred to Apeibopsis. 
Apeibopsis discolor is not especially close to the leaves of the existing 
South American species of Apeiba and though the ancestors of the latter 
might be expected to be represented in North America if they occur in 
Europe, there is no sound basis for such a conclusion and I have, therefore, 
listed Apeibopsis discolor under Incertae sedis. 
