KIDSTON : THE FLORA OF THE CARBONIFEROUS PERIOD. 369 
In Noeggerathia flabellata L. and H. the leaves or leaflets, for 
I think it is uncertain which term to apply to the ultimate divisions, 
are cuneate, with a slightly rounded irregular apex, and whose nerva- 
tion radiates from the wedge-shaped base. Though larger than 
the leaves of Ginkgo, the leaves or leaflets of Noeggerathia flabellata 
L. and H. have a great general resemblance to them, and on account 
of this resemblance, perhaps only superficial, some authors have 
placed Lindley and Hutton's species in Ginkgo phyllum. 
Noeggerathia flabellata L. and H. { = Psygmophyllum flabel- 
latum Schimper) is very imperfectly known, and of its fructification 
we are in entire ignorance. The enrolment, therefore, of Noegger- 
athia flabellata in the Ginkgoacece appears to me to be on insufficient 
evidence. What its true systematic position is remains to be dis- 
covered. 
Conclusion. 
We have now passed in short review the principal genera of 
Carboniferous Plants. In the time at our disposal it has been im- 
possible to mention many interesting but less common species. Nor 
has it been possible to enter into any detailed description of the internal 
organisation of the plants which we have considered. To enter into 
these points in detail is beyond the scope of the present paper, whose 
object is only to give a sketch of the more important plant groups 
of the Carboniferous Formation. 
Many excellent Text Books are in existence, and to these I refer 
the student for a more complete treatment of the subject."^ 
* Schimper, Traits de PaUont. V^get., Vol. I.— III., Paris, 1869-74. Ren- 
ault, Cours de Botanique Fossile, Vol. I. — IV., Paris, 1881-85. Schimper and 
Schenk in Zittel, Handbuch der Palceontologie, II. Abth. Palceophytologie. 
Miinchen and Leipzig, 1879-1890, Williamson; Williamson and Scott; and 
Scott. Various papers " On the Organisation of the Fossil Plants of the Coal 
Measures."" Phil. Trans., London. From 1871 to present date. Seward, 
Fossil Plants for Students of Botany and Geology, Vol. I., Cambridge, 1898 (Vol. 
II. not yet published). Scott, Studies in Fossil Botany, London, 1900. Graf zu 
Solms-I^aubach, Fossil Botany, being an Introduction to Palceophytology from 
the Standpoint of the Botanist, English Edition, Oxford, 1891. Schenk, Die 
Fossilen Pflanzenreste, Breslau, 1888. Potonie, Lehrbuch der Pflanzenpalceon- 
tologie mit besonderer Riicksicht auf die Bediirfnisse des Geologen, Berlin, 1899. 
Zeiller, EUments de PaUobotanique^ Paris, 1900. Kidston, Carboniferous 
Lycopods and Sphenophylls, Trans. Nat. Hist. Soc, Glasgow., Vol. VI. ( new- 
series) part I., pp. 25-140, 1901. 
