9i 
Edith Chick on Torreya My ids tic a. 
PLATE VIII. 
Fig. i.—Diagram of cotyledons of seedling in PI. vii.,.Fig. i. 
A. the shorter cotyledon. 
R. the longer cot3’ledon with its lobe C. 
I'lie small diagrams show the appearance of the cotyledons in trans¬ 
verse section at their respective levels. 
Fig. 2.—Cotyledons of the same seedling seen from both sides. (Region 
within the seed.) 
Fig. 3.—Cotyledons of same seedling with petioles attached. 
Fig. 4.—Cotyledons of seedling shewn in PI. vii., Fig. 3, dissected from 
tlie seed. 
a\b l . the two cotyledons. 
iv.x.y.z. transverse sections taken along the lines similarly 
lettered. 
Fig. 5.—Transverse section at the base of the transition region ( x 280 ) 
The protoxylem is shewn as a group of scattered elements. These 
become obliterated above. 
The same stage is shewn diagrammatically in fig. 6. 
Figs. 6-12.—Series of diagrams from the base of the transition regions 
tracing the cotyledonary vascular bundle into the petiole. I11 figs. 
6-10 the diagrams are bounded by the outer limit of the pericycle. 
ph. phloem. 
x 2 . secondary xylem. 
cb. cambium. 
rt. px. root protox)dem. 
rt. ffir, root metaxylem plate. 
nix. metaxylem strand (continuous with rt. nix. of Fig. 6), 
which becomes attached to the cotyledon-bundle and 
of which the elements in Fig. 8 are partly spiral and 
partly scalariform, and in Figs, io, 11, and 12. are 
entirely spiral and annular. 
Fig. 12.—Cotyledon-bundle in the petiole. Protoxylem and traces of 
metaxylem shewn in the concavity of the kidney-shaped bundle. 
cp. x. centripetal xylem. 
ON THE LEAF-STRUCTURE OF CORDAITES. 
By M. C. Stopes, 
University College , London. 
(With Plate IX.) 
The specimens upon which this note is based were derived 
from the well-known Grand ’Croix nodules of the French 
Stephanian. They include one short series of transverse, and a 
few detached transverse and longitudinal sections of several 
Cordaitean leaves, probably identical with the form which M. 
Renault has correlated with C. principalis of Saint-Etienne 1 . 
Though no striking point of novelty arises from their exami- 
1 B. Renault. Structure comparee de quelques tiges de la 
Flore Carbonifere, pi. 16, fig. 6., p.301. Cours de Bot. foss. I., pi. 
12, fig. 6. 
