Fossil Plants from Lower Carboniferous Rocks. 261 
RHACOPTERIS SUBCUNEATA, Kidston, n. sp. 
[Plate V., Fig. 2; Plate VI., Fig. 1.] 
Description.—Frond pinnate, rachis thick, pinnules alter- 
nate, lax, and divided usually into about eight linear, sub- 
cuneate segments. Veins obscure. 
Remarks.—Several specimens of this species have been 
collected, of which two are shown on Plates V. and VI. 
Fig. 1, Plate VI, gives the lower part of a frond, the 
rachis is stout, being over 3 mm. thick, and gives off lax 
pinnules, which are usually divided into six or seven linear 
subcuneate or spathulate segments—each pair of segments 
seem to form the two arms of a dichotomy. 
Plate V., Fig. 2, shows the upper portion of a frond. 
The lax mode of growth of this species forms one of its 
distinguishing characters. 
Lhacopteris subcuneata is distinguished from Lhacopteris 
jfiabellata, Tate sp., by its clavate pinnule segments, and also 
by its laxer growth, and from Rhacopteris Geikiet, Kidston, 
where the pinnule segments are linear, and spring from the 
sides of a common central axis; while in Lhacopteris sub- 
cuneata the pinnule lobes spring in a flabellate manner from 
a very short foot-stalk, The nervation is not shown on any of 
the specimens, all of which were collected by Mr J. Rhodes. 
The types are preserved in the collection of the Geological 
Survey of Great Britain, Museum, Jermyn Street, London. 
Horizon.—Calciferous Sandstone Series; Lower Limestone 
Series ; Lewis Burn Coal Group. 
Locality.— East bank of Lewis Burn, Barney’s Cut, a little 
over a quarter mile south-west of Lewis Burn Bridge, North 
Tynedale, Northumberland. 
SIGILLARIA YOUNGIANA, Kidston, n. sp. 
[Plate VI., Figs. 2 and 2a.] 
Description.—Stem ribbed, ribs alternately contracted and 
expanded; leaf-scars placed rather above the centre of the 
expansions, slightly broader than long, emarginate at top, 
