12 
towards the petiole the lamina becomes gradually narrower. Midrib stout 
and prominent, giving off numerous secondary veins, usually at right angles ; 
these veins are frequently forked close to the midrib, or the branching may 
occur at varying distances between the midrib and the edge of the leaf. The 
veins are delicate and numerous, approximately fifteen veins per 5 mm. of 
lamina. Towards the apex of the fronds the secondary veins become oblique, 
branching at a wide angle from the midrib.' 1 
This is perhaps the most characteristic plant of the Australian Jurassic 
Flora. The specimens from Talbragar are typical examples, and illustrate 
very well the degree of variation exhibited by the species. In general, the 
widest part of the lamina is nearer the apex than the base ; some specimens 
show a gradual tapering at the base to a long petiole — in one example with a 
total length of 13*5 cm., the petiole is about 1-2 cm. long (this specimen has 
a maximum width of 6 mm.). 
? CONIFER ALES. 
Podozamites lanceolatus (Lindley & Hutton). 
i 
(Frontispiece; Plate V, figs. 1-3; Plate VI, figs. 1-2.) 
1836, — Zamia lanceolata, Lindley & Hutton, Fossil Flora, PI. 194. 
1874, — -Zamites ( Podozamites ) ellipticus, McCoy, Prodromus Pal. Viet., Decade 1, 
p. 35, t. 8, fig. 4. 
1912, — Podozamites lanceolatus , Seward, Mem. Geol. Surv. Ind., Pal. Ind., N.S.. Vol. iv, 
Memoir 4, p. 33, t. iv, figs. 54, 56. 
1919, — Podozamites lanceolatus, Walkom, Qland. Geol. Surv., Pub. 263, p. 49, t. 4, fig. 2. 
(For full synonymy of P. lanceolatus, see Seward (00), p. 242.) 
Typical examples of this species are extremely abundant from Talbragar. 
They consist of a slender axis, whose impression is about 3 or 4 mm. broad, 
bearing lanceolate leaves, reaching a length of about 6 cm., and a breadth of 
7-5 mm. These leaves are undoubtedly spirally arranged, but owing to the 
flattening down during fossilisation, it is not possible to determine the 
phyllotaxy. These leaves are traversed by 7 or 8 parallel veins, which arise 
from the branching of 1 to 3 veins at the base ; this branching, however, all 
takes place quite close to the base of the leaf, and for the greater portion of 
the leaf there is no branching of the veins, which remain practically parallel 
1 Seward (04a), p. 168. 
