202 L. Lesquereux on the Coal-Formations of the United States. 
To the genus Cordaites thus characterized: stem simple, annulate 
or marked by the persistent base of the leaves ; leaves simple, clasping 
at the base, long-linear, marked by simple, equal, parallel, rarely jork- 
ing nerves:—I would refer all those ribbon-like leaves so abundant 
in our coal measures, and generally found in broken fragments. 
Noeggerathia palmeformis Gopp., recently found in the coal fields 
of Llinois, V. Becnertiana Gopp., N. ovata, N. abscissa, N. dichotoma, 
N. tenuistriata, N. Bruckeriana, N. crassa, all species of the same 
author are referable to Cordaites. At least as much as can be 
seen from the figures that mostly represent fragments of leaves.* 
2. Cyclopteris Bret. By somewhat extending the definition of 
the genus Cyclopteris, it would be easy to place in it most of the 
species, if not all, of the genus Noeggerathia. But the name of 
this last genus has the priority to that of the former, and more- 
over the fine descriptive name, Cyclopteris, represents a kind of 
leaves far different from those to which Sternberg applied the 
name of Noeggerathia.t At first, it contained a number of species 
established for isolated round leaflets which a more careful ob- 
servation showed to belong to species of Neuwropteris. As the 
— of species of Cyclopieris to species of Neuropteris is not — 
easi 
limited by Brongniart in his Tableau des Genres: frond simple, 
pedicellate, symmetrical, round, cordiform or flabellate, entire or lobed, 
the nerves coming out from the 
sf soe 
3. Neuropteris Bret. ‘sopert had in his 
europteris Brgt. The celebrated Gdppe eae 
_ * Prof J. W. Dawson has adopted the same views in a paper recently pub- 
lished in the Canadiin Naturalist. es 
“+ Jac. Néggerath to whom the genus is dedicated is author of valuable researches 
on fossil trees and stems published at Bonn, 1820-21. hae 
