35 i FOSSIL FLORA OF SOC'THERX PORTION OF THE YORKS. COALFIELD. 
the scars are very large and closely set. and the internodes are of 
unequal length. In the present s})eciinen four large branch scars are 
seen above (*) a node. The internodes have well-marked longitudinal 
primary ridges, distant about 2 cm. from each other, and between 
these occur numerous faint and very slight secondary ridges, anas- 
tomosing with one another, and forming an elongate network. In 
this latter respect we have an interesting approach to the genus 
Dicti/ocalamites Arber (f), in which the surface reticulations are more 
l)rominent. The scar-bearing internode is about 9 cm. in length. 
The leaf-scars on the nodes are not clearly seen. 
It is possible that the specimen which I have previously figured 
from Nottinghamshire (J) may be allied to that under discussion 
here. 
Sphenojiteris; Potieri Zeill. 
Plate XXXIX., Figs. 2 and 3. 
1886-88. Sphenojneris Potieri^ Zeiller, Flore Foss. Bass. Houill. Valen- 
ciennes, p. 88. pi. 14, fig. 1. 
The frond figured on pi. XXXIX., fig. 2, natural size, appears to 
me to be identical with Zeiller's S. Potieri, a very rare plant, apparently 
hitherto unknown from Britain, and one of which only one specimen 
seems to have been previously recorded. This species is characterised 
by the very prominent longitudinal ridges on the rachises of all 
orders, by the broad lobes of the pinnules with undulating but not 
toothed margins, and the strong tuning fork " lateral nervation. 
The latter is seen in part of a pinnule enlarged three times on plate 
XXXIX., fig. 3. 
Sphenojyteris Lay rent i Andrii. 
Plate XL., Fig. 2. 
1865. Sj)henoj)teris Laurentii , Andra. Vorweltliche Pfanzen, p. 39, pi. 
13, figs. 1-3. 
1865. Sphenopteris stijmlata, Andra, ibid., p. 40, pi. 13, fig. 4. 
1868. Sphenopteris stipulata, (von Gutbier), Eoehl, Palaeonto(/r.. Vol. 
XVIII., p. 58, pi. 16. fig. 6a. 
* Fig. 1, PL XXXIX is reversed, so that the branch scars appear 
to lie belcw the node. A. A. 
t Arber (1912), p. 97. See also Arber and Lawfield, I.e. 
i Arber (1910). Proc. Yorks. GeoL Sac., Vol. XVII., p. 144, 
pi. XIII., figs. 1 and 2. 
