[MATTHEW] CLIMATIC ZONES IN DEVONIAN TIME 137 
flexed at the branching points has few and short pinnules, but the fruit- 
ing branches or stems seem not to be known. The author of the memoir 
thinks it the same with a Sphenopteris referred erroneously to (S. 
Hooker) from Bandon, Ireland, described by Baily, and he says also 
that the Triphyllopteris elegans from Belgium described and figured 
by F. Crepin is very similar to this species. 
In this connection Dr. Nathorst remarks on the absence of ap- 
parent veins in the leaves of many species of this Bear island flora, a 
character found in a number of species of the Silurian floras of New 
Brunswick. 
A very peculiar filicoid plant, which Dr. Nathorst refers to the 
Fern family Marattiaceæ, is Cephalopteris (C. mirabilis). This new 
genus is peculiar in having the fruiting organs in separate pinnæ under 
the forks of the frond, while the vegetative pinnæ are shown only in 
small fragments and are rare. They are like those of other fragments 
on the same plate referred to Sphenopteridium. This clustering of 
the fruiting organs on a special pinna under the fork of the frond is 
also'a marked character in Aneimites and Triphyllopteris of the Devonian 
and Lower Carboniferous floras of Europe and America. Dr. Nathorst 
compares Cephalopteris with the Crossotheca Crepini of Zeiller and the 
Calymmotheca asteroides of Lesquereux, saying they have a somewhat 
similar form; he however points out generic differences. 
An important type of this flora is Archeopteris fimbriata, one of the 
species of this genus with lacineate pinnules. Dr. Nathorst compares 
it to Schmallhausen’s A. fissilis of the Upper Devonian of the Donetz 
basin in Southern Russia (lat. 50° N.). Another of the same type of 
Archæopteris appears to be Lesquereux’s A. sphenophylloides of the 
middle Devonian of Pennsylvania (lat. 42° N.) if one may judge by 
that author’s description, but Lesquereux gives no figure of his species. 
The entire and lobed-leaved species of- Archæopteris are repre- 
sented by a species well shown by the stems, leaves and fruit, A. Roe- 
meriana Güpp. Dr. Nathorst considers the Paleopteris hibernica— 
minor of Crepin from Belgium as identical with this species. Some 
of the American species are very like this one, as A. Halliana Gopp sp, 
(=A. laza, Hall). A. Rogersi, Dawson, also says Nathorst, comes 
very near to A. Roemeriana. 
Dr. Nathorst found a few examples of a Sphenophyllum, S. sub- 
tenerrimum, showing the existence of this Equisetaceous type at Bear 
Island. 
A remarkable plant occurs here somewhat plentifully, showing 
much variety of form and peculiarity of structure, intermediate between 
the Sphenophyllales and the Calamariales, for which Dr. Nathorst 
found it necessary to establish a new class, the Pseudoborniales, with 
