Mr. L. F. Ward on Mesozoic Dicotyledons. 389 
tischen Zone,” which appeared in 1874 in volume iii. of his 
‘Flora Fossilis Arctica.’ In this work he describes one 
solitary dicotyledonous species (Populus primeva) in the 
schists of Kome—Urgonian—by far the most ancient form 
thus far met with, and 33 species in the higher strata of Atane, 
which are now generally believed to correspon() with the 
Cenomanian of Europe. These researches of Heir appeared 
too late to be embodied in Schimper’s great work. 
Finally, as crowning this fruitful year’s labour, appeared 
Mr. Lesquereux’s important quarto volume on the Cretaceous 
Flora of the Western Territories *, reviewing the results of - 
all previous researches in this country, and describing and 
illustrating 107 species of American Cretaceous Dicotyledons. 
In Hayden’s annual report for the same year f 26 species are 
described and some figured, but most of these were also more 
fully treated in the ‘ Cretaceous Flora.’ 
During the succeeding six years little activity was mani- 
fested in this field, the attention of paleeobotanists being prin- 
cipally directed to the floras of later formations ; but in 1880 
Hosius and Von der Marck published, in the ‘ Paleonto- 
graphica’ f, their “ Flora der westfalischen Kreideformation,” 
an important work reviewing the entire Cretaceous flora of 
Westphalia. Although fossil plants have been found through- 
out almost the entire Cretaceous series as there represented, 
still it was only in the Senonian that any Dicotyledons were 
detected. At two quite distinct horizons within the Senonian 
such plants were found, 37 species being credited to the Upper 
and 24 to the Lower Senonian, or 61 species. 
Quite an important paper by Dr. Debey appeared in 1881 §, 
describing certain very interesting querciform leaves from the 
sands of Aix-la-Chapelle. Fifteen species are described and 
well illustrated, all of which are referred to Dryophyllum, a 
genus founded long ago by Debey on unpublished material, 
aud to which Saporta refers four of the forms from the traver- 
tines of Sézanne. It had been announced || that Debey had 
collected in the vicinity of Aix-la-Chapelle no less than two 
* “Contributions to the Fossil Flora of the Western Territories, 
Part 1. The Cretaceous Flora.” By L. Lesquereux, being Report of 
the U. 8. Geological Survey of the Territories, F. V. Hayden, Geologist- 
in-charge, vol. vi. Washington, 1874. 
+ Pp. 271-565, pls. i—viil. 
¢ Vol. xxvi. 1880. 
§ “Sur les feuilles querciformes des sables d’Aix-la-Chapelle,” par 
M. Debey. Bruxelles, 1881. (Compte rendu du Congrés de botanique 
et @horticulture, 1880.) 
|| Schimper, ‘ Traité de Paléontologie Végétale’ (Paris, 1869-1874), 
tome iii. pp. 671, 675. 
