264 CATALOGUE OF THE FOSSILS OF THE PERMIAN SYSTEM 
and the only one that resembles the R. membranacea of the Moun- 
tain-limestone in its singular funnel-shaped mode of growth. 
PLANTA: 
42, LEPIDODENDRON. 
Portions of the stem of a species of Lepidodendron are occa- 
sionally found in the Lower-new-red-sandstone at South Shields, 
and in the Marl-slate at Cornforth. 
43. CALAMITES. 
A fragment of a fine species allied to the C. approximatus of 
the Coal-measures was found in the sandstone quarries of South 
Shields, and is preserved in the Newcastle Museum. 
44. VOLTZIA. 
Several fucoid plants occur in the Marl-slate. One has been 
figured as a Voltziz in the “Fossil Flora,” vol. iii, p. 195. As 
they are imperfectly preserved, it is uncertain to what genus 
they really belong. Some of them have been termed Cauwlerpites 
