310 
PROFESSOR W. C. WILLIAMSON ON THE ORGANIZATION 
share the same fate, there being no longer any independent grounds for their retention. 
I propose therefore to adopt the generic term Lepidophloios for the plant which is the 
chief subject of this memoir. The necessity for the destruction of several genera just 
indicated suggests the probability that a number of specific names will have to suffer in 
like manner. I am satisfied that all attempts to apply specific names to the plants of 
the Coal-measures can but be provisional, until we learn more than we at present know 
of the effects of age upon their form and organization. Still, though they may not have 
any permanent value, such names are necessary for working purposes. I would there-, 
fore provisionally distinguish the subject of this memoir as Lepidophloios brevifolium * . 
I cannot close this memoir without expressing my obligations to Dr. Dawson, of 
Montreal, who first directed my attention to the Burntisland deposit, and yet more to 
G. Grieve, Esq., of Burntisland, by whom the deposit was discovered. I am not only 
indebted to the latter gentleman for his personal guidance to the locality whence the 
fossil plants are derived, but he has laboured most indefatigably to keep me supplied 
with abundance of raw materials upon which to pursue my investigations. The deposit 
itself is a very remarkable one, apparently consisting of detached masses of peat imbedded 
in volcanic amygdaloid. Here and there fragments of the fossil plants occur charred to 
the extreme of blackness, but such is not their ordinary condition ; they are usually of 
a rich brown colour, and the perfect way in which their most delicate organization is 
preserved leaves little to be desired. 
Appendix. 
Received and read December 19, 1872. 
Since the remarks on page 306, relative to the growth of the new vascular layers of 
the ligneous zone of the Lepidodendra tvere penned, I have endeavoured to satisfy myself 
yet more thoroughly respecting the relations which this subject bears to the views of 
modern botanists on the general question of new vascular growths. Some years 
ago physiologists would have agreed to regard the new vascular layers described in 
this memoir and its predecessor (Part II.) as the products of a cambium-layer. Latterly, 
* In a letter from Dr. Dawson, dated Nov. 28, 1872, that observer informs me that he regards the Burntis- 
land plant as identical with Lepidodendron Veltheimianum. Mr. Cakruthers, on the other hand, rejects this 
identification. Until the very characteristic macrospores of my plant are shown to exist in some of the localities 
in which the Lejp idoclen dr on Veltheimianum is common, I think it best to retain my proposed provisional name. 
I find these macrospores associated with a section of Witham’s original specimen of Anabathra pulcherrima, for 
which I am indebted to Professor King, and have not a doubt that the latter is identical with the Burntisland 
plant ; but I have not sufficient proof to establish this point with the certainty requisite for a scientific determi- 
nation. I trust that the Geologists of the Scotch Survey will succeed in obtaining from Witham’s locality of 
Lennol Braes the decisive evidence which I doubt not will some day be forthcoming. Professor Geikie kindly 
informs me that he regards the Burntisland deposits as belonging to the upper part of the calciferous sandstones 
of the Burdiehouse series, and that the Lennel Braes rocks belong to nearly the same stratigraphical horizon. 
