F. V. Hayden on the Cretaceous rocks of the West. 177 
tions. These genera are yet living and they are also found in 
the Tertiary formations. 
“Tf we compare these plants of Nebraska with the Cretaceous 
plants of Kurope, we find no identical species among them. I 
sent drawings of them to Dr. Debey of Aix la Chapelle, who dis- 
covered in that locality a Cretaceous flora. He has written to 
me that he has not found one species identical. Even the greater 
part of the genera are different. There is but one Cissites (C. 
aceroides Debey) which recalls slightly the C. insignis (Plate tv, 
fig. 5). The Cretaceous plants of Henant, Belgium, those of 
Blankenburg and Quedlinburg are also very different. 
“ Prof. Schenk has recently sent to me, a collection of plants 
of Quedlinburg for determination. Besides conifers and ferns 
characteristic of the chalk, it contains dicotyledons, but no 
forms like those of Nebraska. 
“The Cretaceous flora of Moletein, Moravia, which I have 
lately studied, exhibits more resemblance. It contains two spe- 
‘ cles of Ficus which much resemble the Ficus of Nebraska, two su- 
—_ species of Magnolia, one with a fruit cone. There is a re- 
ationship between the flora of Nebraska and that of the —— 
Chalk of Europe, although identical species are wanting. But 
to the present time no characteristic genus of the Cretaceous flora 
of Europe has been found in Nebraska. 
“If we compare the plants of Nebraska with the Tertiary plants 
we find no identical species, but 7 genera, (Populus, Salix, Fi- 
eus, Platanus, Andromeda, Diospyrus and Magnolia) are also* 
Miocene and likewise living. It then appears that the Nebraska 
flora is related more to the Tertiary than to the Cretaceous flora 
of Europe, a fact which strack me when I first saw drawings of 
the former. But it should be remarked that we know but a 
very small number of American species, and on the other hand, 
the European Cretaceous flora has more relationship with the 
Tertiary flora than I at first supposed. I have found in the Cre- 
taceous flora of Moletein, Moravia, species of Ficus and Magno- 
lia which resemble Tertiary species; a Myrtacea, which is a near 
neighbor to the Eucalyptus rhododendroides, Mass, of Mt. Bolea; 
a Juglans and a Laurinea, which also have their analogues in the 
ertiary flora; a Pinus and two other conifers which belong to 
the genus Sequoia, which was extensively distributed in Europe 
and America in the Miocene epoch and which is now only found 
in California. 
‘As the Cretaceous fishes are more nearly related to the Terti- 
ary than to the Jurassic fishes, the upper Cretaceous flora is also 
entirely different from the Jurassic and more nearly allied to 
the Tertiary floras, and it appears that in America the relation 
between the Tertiary and Cretaceous flora is yet more intimate 
fan in Europe. Pre 
