68 L. Lesquereux on the Coal Formations of N. America. 
data Brgt. which I had opportunity to examine. It may be also 
that Neuropteris smilacifolia Sternb., N. plicata Sternb., N. rotun- 
difolia Brgt., ought to be referred as varieties to Newropteris flexu 
osa Brgt. Nevertheless, we have these same scarcely distinet 
species with just the same characters in America. They are 
mostly found in the same places where Newropteris flexuosa 
abounds. Of the other American species of this genus, Neurop- 
teris Clarksoni Lsqx. is closely allied to Neuropteris auriculata 
Brgt., and Newropteris Desorii Lsqx., to Odontopteris Reichiana 
Lsqx. should perhaps be referred, by its peculiar nervation, to 
the genus Sonopteris of M. Ponsel. 
Odontopteris Brgt.—I have counted Odontopteris Brardii Brgt., 
among the species belonging to both continents, on the authority 
of M. Unger, who indicates it at Mauch-Chunk, Pennsylvania. 
Nevertheless I doubt of the identity of our species with the true 
0. Brardii Brgt. The small specimen which I formerly referred 
to it belongs to another species, Odontopteris crenulata Bregt., and 
I would rather suppose that some incomplete specimen of Odon- 
topterts alata Lsqx., has been mistaken for the true 0. Brardia 
Brgt. Our species, though closely related to the European form, 
evidently differs from it by its obtuse leaflets, and by the position 
of two large, opposite, cuneate, truncate leaflets attached to the 
rachis just below the base of the pinnse.—Odontopteris Schlothet- 
mit Brgt., common to both continents, is one of the few species 
which, either in its fructified or sterile form, show a perfect iden- 
tity at any locality where it is found. 
Dictyopteris Gutb.—The affinity of the European Dictyopteris 
Brongnarti Gutb. with our Dictyopteris obliqua Bunby., is so great 
that these species could be considered as mere varieties of the 
same. D. obliqua Bunby. has narrower, less obtuse leaflets. 
These are generally found detached from the stem and spread 
over the shales in the greatest abundance 
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