50 FLORA OF THE MONTANA FORMATION. 
Black Buttes, Wyoming, a single badly preserved example that appears 
to belong to this species, which seems to have escaped observation 
until now. This leaf has the same cordate shape and areolate nerva- 
tion as those from the American type locality. It has a short petiole, 
which seems to be attached to it. The impression of this specimen is 
nearly effaced from the stone, but so far as can be made out it is 
clearly this species. None of the other collections from Black Buttes 
contains specimens. 
The question as to the correctness of the generic determination of 
this species is still an open one, as is also the question of the exact 
identity of the American material with the type of F. asarifolia from 
Bilin. The leaves figured by Ettingshausen (op. cit.) are nearly cir- 
cular or broadly oval in outline, while ours are much broader than long, 
being reniform. The base is approximately the same shape in both. 
The Bilin specimens have a finely crenulate border, while the Ameri- 
can specimens have from five to seven quite marked rounded lobes, 
especially the larger leaves. Some of the smaller leaves, spoken of by 
Lesquereux ' as variety minor, are usually entire, without either lobes 
or crenations. The primate nervation is practically the same in the 
European and American specimens, although there are slight minor 
differences. The ultimate nervation, however, is quite different, there 
being in the Bilin specimens well-marked free venules within the quad- 
rangular meshes, as in the Drymaria 2 type of ferns. These differences 
seem strong enough to exclude the probability of the European and 
American specimens being specifically identical, but for the present I 
have decided to retain them as established by Lesquereux. 
These leaves seem to have a strong resemblance to the genus Menis- 
permum, some of the larger leaves being especially like M. canadense 
of the eastern United States. This living species has the same form 
and lobed outline, and the same primary and finer quadrate nervation. 
It has the free venules, however, like the Bilin specimens, thus differ- 
ing from the American, and, further, the quadrate nervation, while 
being much the same shape, is not raised, as in the American specimens. 
It may possibly represent an allied species of Menispermum. 
It has been suggested that the American leaves resemble and are 
possibly related to leaves of Bowlesia, a small delicate umbeliifer from 
southwestern United States, but careful examination fails to reveal 
more than a superficial resemblance between them. The leaves of 
Bowlesia are smaller, more markedly lobed, and with a coarser nerva- 
tion, which is not at all raised, as in the Point of Rocks specimens. The 
leaf of Bowlesia is thin and delicate, while the fossil leaves under dis- 
cussion were evidently thick. 
Habitat. — Point of Rocks, Wyoming. Black Buttes, Wyoming (single 
obscure specimen). Golden, Colorado? " 
'Bull. U. S. Geol. and Geog. Surv. Terr., Vol. I, p. 367 (1875). 
2 Ci'. Gard. aud Ett., Brit. Eoc. Fl.. Vol. I, p. 25 (1880). 
