4 ROYAL SOCIETY OF CANADA 
definite surface markings that distinguish the Coal-Measure plants 
thus designated. 
The Lepidodendra of this list are much more common plants of the 
Devonian beds, and so, more characteristic, than the plants last 
mentioned; but here also one notices the prevalence of species with 
small areoles, as Dawson himself has stated, and the species would rather 
fall under Sagenaria of Brongniart and the old German authors, or 
Bothrodendron L. & H. of more recent geologists, than under the type 
represented by the Coal measure species of Lepidodendron. The same 
may be said of Leptophleum and Lepidophloios. 
In Psilophyton one strikes a type which above all others, Sir William 
seems disposed to regard as preéminently a genus of the Devonian Age. 
He has recognized it, even as low down as the Silurian, in Gaspé, and 
the most typical species has been found to extend through the Devonian 
terranes; it is with reason then regarded as one of the most notable 
forms of this system, and the author of the genus has given much care to 
its study. Mr. Penhallow has added a species to this genus from the 
Hamilton beds of the New York series.’ 
Arthrostigma and Cyclostigma have species in the lower and middle 
Devonian of Gaspé, with small leaf scars, described by Sir William, but 
it is among the Filicoid plants (or more probably Cycadofilices) that we 
find some of the most marked Devonian types. 
The old genus Cyclopteris was formerly the receptacle for most of 
these; as now distributed there are two genera (often regarded as one) 
that contain most of the Devonian forms. The first that I shall refer to 
is Aneimites. Dawson established this genus to contain the species 
A. Acadica, from the Gaspereau R. in Nova Scotia, in beds which he re- 
ferred to the Lower Carboniferous. According to Schemper the genus 
is Devonian as well as Lower Carboniferous, and some geologists regard 
the beds in which it occurs as Upper Devonian. It is difficult to distin- 
guish this genus from Triphyllopteris of a similar horizon in Europe. 
The genus Archæopteris in which the venation is similar to Aneimi- 
tes, but in which the pinnules are arranged on the rachis in a more 
exactly pinnate manner, and in which the fruiting bracts, in place of 
being tufted at the base of the vegetative pinnæ, are pinnately 
distributed on one or more fruiting pinnæ along the rachis, is abundant 
in the Devonian floras. This genus above all other of the Filicoid plants 
is characteristic of Devonian strata, for while plants of the Aneimites 
type range from the Silurian to the Lower Carboniferous, this seems to 
abound most in the Devonian beds; it is true that in the middle States 

1 Notes on Erian Devonian Plants from New York and Pennsylvania. Proc. 
U.S. Nat. Mus. Vol. XVI. p. 105, 1893. 
