texture of the leaf, and the fine, not prominent secondary veins. A genetic 
relationship between the former and the latter is therefore still probable. 
Fagus Gunnii, Hook, fil., has deciduous, almost herbaceous, small, 
broad leaves, of ovate-elliptical form. They are obtuse at both ends, and the 
margin proportionately crenate. As regards venation, these leaves differ 
essentially from those of the two former Australian species, inasmuch as the 
secondary veins do not terminate in the teeth of the margin, but in the sinuses 
between them. On each side of the midrib issue five secondary veins, very 
prominent underneath. The tertiary veins are very fine, short, merging into 
a delicate net. This species differs from Fagus Wilkinsoni mostly in its 
deciduous leaves and in its venation. It belongs to another group, and 
must have descended from a peculiar and as yet unknown ancestral species. 
I named the above described fossil species in honor of C. S. Wilkinson, 
Esq., E.G.S., Government Geologist of New South Wales, who has rendered 
much valuable service in connection with the geology of the Australian 
region referred to. 
Locality and Horizon. — Dalton, near Gunning ; in hard siliceous grit, 
reposing on Silurian rocks. 
Eagijs eisdoniana, sp. nov. 
Plate I, Figs. 18-20. 
Sp Char. — E. foliis coriaccis ovatis vcl ovato-oblongis, utrinque acutis, 
vel apice acuminatis, margine simpliciter vel rarius duplicato-dentatis; nerva- 
tionc craspedodroma ; nervo primario paullo prominente, recto, apicem versus 
attenuato ; nervis secundariis numerosis, subangulis 45-50° orientibus, dis- 
tinctis simplicibus ; nervis tertiariis angulo subrecto exeuntibus tenuissimis 
simplicibus, vel ramosis, inter se conjunctis et rete tenerrimum includentibus. 
• Ohs . — The beech leaves from the tertiary strata of Itisdon (PI. I, 
figs. 18-20), belong certainly to only one species, differing only slightly from 
one another as regards size and form. As regards their characters, these 
leaves are intermediate between those of the still existing F. Moorei , E. Muell., 
and the above described F. Wilkinsoni. According to the best preserved 
specimen (Eig. 20) the texture must be regarded as coriaceous. The form is 
ovate-oblong, the base more or less acuminate, the apex somewhat prolonged, 
