XXVl INTRODUCTION. 
GREENLAND. 
Without quoting the Kome beds of Greenland as undoubtedly 
agreeing in the character of their flora with the Wealden of 
England and North Germany, it must be noted that Heer has 
insisted on the fact that there are several features in common 
between them and the rocks of Wealden age in more southern 
latitudes. 
This well-known flora! has been collected from several localities 
in the Noursoak Peninsula on the west coast of Greenland; it 
is characterized, among Greenland fossil floras, by the almost total 
absence of Dicotyledons. We shall be in a better position to 
examine the general characters of the Kome plants, and take 
note of such species of distinctly Wealden type as are repre- 
sented in these northern latitudes, when we have completed the 
description of the English Wealden flora. 
Heer points out, that in spite of the small number of species 
in common, there are enough to form a connecting link between 
the Kome flora and those of the Wernsdorfer beds and typical 
Wealden districts; certain nearly allied species are quoted in 
support of this assertion. Johnstrup, in the French resumé at 
the end of the fifth volume of the Meddelelser om Gronland, 
speaks of the Kome flora as undoubtedly Urgonian in age.? The 
same flora is referred to by Dawson in a recent number of 
‘‘Nature,”* as probably corresponding to the Kootanie of 
Canada and the Wealden of England. 
AMERICA. 
An exceedingly important work has recently been completed by 
Prof. Fontaine, in which an abundant and varied flora is described 
from the Potomac beds of North America. The term ‘‘ Potomac ”’ 
* Fl. foss. Arct. vols. iii. vi. and vii. See also Meddel. Grénland, vol. y. 
1883. For list of fossils see Fl. foss. Arct. vol. vii. pp. 173 et seg. 
2 Heer, doc. cit. vol. vii. p. 157. 
> Meddel. Gronland, doc. cit. p. 227. 
* Vol. xlvii. 1898, p. 557. 
