204 Benson . — Cordaites Bellas, sp. nov., a Cordaitean Leaf 
The specimens which are here regarded as representing the thicker 
parts of the leaf of C. Felicis correspond in structure much more closely to 
the forms called C. robustus and C. loculosus by Felix. That such forms 
represent the non-assimilating part of the leaf seems obvious from their 
structure, as there is no apparatus for gaseous exchange with the external 
atmosphere. Moreover, they occur with sections possessing a stomatiferous 
surface , 1 and all grades of intermediate structure occur. The treatment of 
such forms by Felix as different species has rendered it necessary to apply 
a new specific term to the new type, as it is impossible to identify it with any 
one by itself of the three forms described by Felix. Otherwise it might 
Text-fig. Transverse section of a single bundle surrounded by its sheath, x 225. The 
centripetal wood ( x ') is in marked contrast with the centrifugal ( x ). The protoxylem (Px) is separated 
by a single layer of parenchyma from the centrifugal wood. The elements of the centrifugal 
wood which contribute to the inner sheath (Is) are larger than the intervening elements. The 
inner sheath is limited to the abaxial part of the bundle, but the outer sheath is well developed 
all round the bundle. Some of the phloem elements are indicated by the letter P. Shore, C. N., 
72. 1. 
have been best to avoid introducing a new specific term on differences which 
do not amount to much more than that of size and robustness of develop- 
ment (vide next section). 
1 Felix : loc. cit., p. 62. * Other leaves of this species, i. e. C. Wedekindi , occur in the section 
from the Kgl. geol. Landesanstalt, No. 109.’ It was in this section that the specimens called 
C. loculosus occurred ( vide p. 71). 
