Fossil Plants from Lower Carboniferous Rocks, — 259 
PLUMATOPTERIS ELEGANS, Kidston, n. sp. 
[Plate V., Figs. 1 and 1a.] 
Description.—Frond bipinnate (or tripinnate ?), pinne 
oblong, blunt, alternate, sessile, decurrent, entire, sinuous 
or slightly lobed in their basal portion. Midrib distinct, and 
giving rise to numerous thin simple or dichotomous veinlets, 
which spring from the midrib at an acute angle, and run 
with only a slight curvature to the margin. The bifurcation 
of the veinlets takes place close to the midrib, so that the 
veinlets generally appear to be simple. 
Remarks.—The pinne are almost entire except at their 
lower part where they join the rachis; here, on the upper 
side, and occasionally also on the lower side, a small oblong 
pinnule is separated off. Any appearance of pinnules on 
the upper part of the pinnze seem to result more from the 
effect of a splitting of the tissue than a distinct pinnule 
formation. The pinne are slightly decurrent, but the rachis 
is not winged, 
Horizon.—Carboniferous Limestone Series; Lower Lime- 
stone Series of the Calderwood group. 
Locality— Limekilns, East Kilbride, Lanarkshire. 
The specimen figured was, I believe, collected by the late 
Mr A. Patton. 
SPHENOPTERIS Dunst, Kidston, n. sp. 
[Plate 1V., Figs. 1-4.] 
Description.—¥rond broadly lanceolate, tripinnate, primary 
pinne deltoid lanceolate, opposite on lower, but alternate on 
upper part of frond; secondary pinne alternate, lanceolate, 
bearing at the base of the lower pinne a few small lanceolate 
tertiary pinnz; the upper portion of the lower secondary 
pinne, and the whole of the uppermost secondary pinne 
merely bear lobed or entire pinnules. Pinnules very small, 
about 1 mm. long, oval or lobed; nervation sphenopteroid. 
Main rachis moderately thick, and finely striated longi- 
tudinally. 
