PART 3.] Feistmankl: SjiheHoph^lhm anil Triz^ffia speciosa 
165 
There is no representative of this fossil plant in the carhoniforons hods of 
Europe, the leaves being joined to an undivided spathe at their base, and free in 
the upper part. 
As regards the other two, Scliizone^ira and Trizygia, I find the following 
remark about them in Grand’-Eury’s groat work on the carboniferous flora in 
France,' page 404:— 
“ II faut cependant hien reconnaltre que certaines plantes des terrains secon- 
daires inferieurs ont des attaches avec cellos des terrains primaires.lo 
Trizgyia speciosa de Roylo, resemble S. un Sphonophyllimi ohlongifoUmn qui dovi- 
endrait heacoup plus ample ; les Schizoneura du gres higarr6 y suppleeraicnt aux 
Asterophyllites.” 
As far as ScMzcmeura is concemed, this thesis seems probable, this genus 
also having linear leaves, in whorls, which are however in most of the cases 
joined to two broader, encircling leaves, which morphologically originated from 
a spathe (sheath), to which all the loaves are joined in the beginning of the 
growth of the plant. 
With Trizygia we will have to admit a slight modification. Trizygia was first 
projDosed by Royle on account of the arrangement of the leaves, always six in 
three pairs on one side of the joints; this character is completely constant in all 
the specimens hitherto observed; the species was Triz. speciosa. 
Mc’Clelland (1850) described it as Splienophyllum speciosum; Unger (1850) 
as Splienophyllum trizygia. 
I myself followed Unger’s example in my first notices on the Damuda flora 
(1876) ; but after these various researches on the nature of the carboniferous 
Equisetaeem, I would return to Royle’s original denomination, i. e., Trizygia. 
From the preceding notes on the genus AsteropJiylUtes and Spli&nopjlvylhini, 
it would appear that some forms of these two genera may belong to the same 
plant, hut in some other cases Splienophyllum is an independent genus. 
In the Indian coal-fields the form Trizygia, said to he i-epresentativo of the 
carboniferous Sp/iewop/ti/iJawi., is not associated with any Astcropliylhtes, there being 
no true Asterophyllites found; nor can it belong to Schizoneura, which to some 
extent ean he considered as representing the Asterophyllites; for amongst tlio 
very numerous specimens of Schizoneura from the Indian coal-beds, not one 
specimen was observed which would show that the Trizygia might in some way 
ho connected with Schizoneura ; in the Talchir coal-field there is Trizygia without 
Schizoneura, and in the European Trias, where Schizone^ira occurs, no trace of 
any form of the kind of Trizygia, or any Splienophyllum, has hitherto boon 
detected. Trizygia can therefore very well bo considered an independent genus, 
having no connection with Schizoneura, as those forms of Splienophyllum, which 
have no connection with Asterophyllites; but I also think Trizygia will have 
to be considered as differing from the true Splienophyllum. 
In this latter the leaves are arranged in complete whorls round the joints, and 
the stalk is pretty thick, so that we have to consider it as an erect plant, growing 
' Flore carboniferc du Dptint. dc la Loire et du Centre de la F}'ance, 1877. 
D 
