FOSSIL FLORA OF SOUTHERN PORTION OF THE YORKS. COALFIELD, 353 
A representative collection of the species in the above list, recorded- 
under the authority of the Author, is 2)reserved in the Sedgwick Museum, 
Cambridge, Nos. 2741 to 2814 in the Carboniferous Plant Collection. 
NOTES ON THE FIGURED SPECIMENS. 
I append figures of some of the more interesting specimens recorded 
above, with some remarks upon them. 
Calamophloios verticillatus (?) L. and H. 
Plate XXXIX., Fig. 1 (J nat. size.) 
External surface of stem. 
1893. Calamitina verticillata , Kidston, Trans. Roy. Soc. Edinh., Vol 
XXXYIL, p. 311, pi. IV., fig. 18. 
1911. Calamites verticillatus (pars), Jongmans, Anleit Bestim. Karhoiq)fl. 
West-Europas., Vol. I., p. 61, fig. 67. 
Pith-casts. 
1835. Calamites verticillatus, Lindley and Hutton, Foss. Flora, Vol. 
II., pi. 139. 
1886-88. C alamo phyllites verticillatus, Zeiller, Flore Foss. Bass. Houill. 
Valenciennes, p. 360, pi. 57, fig. 2. 
1910. Calamites varians, Renier, Doc. Etude Pal. Ter. Houill., pi. 45, 
1911. Calamites verticillatus (pars), Jongmans, Anleit. Bestim. Kar~ 
honjyfl. West-EurojKis, Vol, I., pp. 61, 62, fig. 68. 
I have recently instituted (*) the genus Calamophloios for the 
reception of specimens showing the external surface of Calamite stems 
as opposed to pith-casts. The specimen figured on pi. XXXIX., 
fig. 1, reduced in size, is an example of a rare Calamite stem showing 
the external surface. Several pith-casts, probably belonging to the 
same species, have been figured by Zeiller and Renier, and probably 
by Lindley and Hutton. The type of the authors last mentioned i,s, 
however, lost, but from the somewhat rough drawing which they give 
of it, one may conclude that the specimen was more probably a pith-cast 
than the external surface of a Calamite stem. 
These stems belong to the Calatnitina section of the genus, char- 
acterised by the periodic occurrence of branch scars. In this species 
* Arber (1916), p. 140. See also Arber, E. A. N. and Lawfield, 
F. W., On the External Morphology of the Stems of Calamites, 
Journal of the Linnean Society, Bot. Vol. XLIV, 1920, pp. 507-530, 
pi. 23-25. 
