3 G 
the margin distinctly dentate, the teeth generally simple ; hut in Pig. 18 the 
dentation becomes double towards the apex. The venation is perfectly 
craspedodromic, the midrib comparatively somewhat prominent; the secondary 
veins are more numerous, and also somewhat more strongly developed than 
in F. TVilkinsoni , and their originating angles more obtuse, thus clearly 
indicating an approach to the F. Moorei. The tertiary veins arc very fine, 
branching and connected, and, together with the leaf net, very similar to those 
of the living species referred to. (Compare the enlargement of the venation, 
Pig. 20 a.) 
The Fag us risdonianci also betrays much analogy, on the one hand, with 
the Miocene F. Dencalionis * (the progressive form of the F. F cronies, Ung.), 
from which it is distinguished only by the thicker texture, and the generally 
simple dentation of the margin, and, on the other hand, with its descendant, 
the F. ferruginea, Ait. The Fag us risdonianci may therefore justly he con- 
sidered as the genetic connecting link between the Eocene F. TVilkinsoni, and 
the still existing F. Moorei, and, indeed, as the descendant of the former and 
the ancestor of the latter. 
Locality and Horizon. — Risdon, Tasmania ; in yellow Travertin of 
Upper Tertiary age. 
Collection. — British Museum (Natural History Branch). 
Castanopsis Benthami, sp. non. 
Plate II, Fig. 10. 
S 'p. Char. — C. foliis coriaceis elongato-lanceolatis, integerrimis, basi 
acutis ; nervatione camptodroma ; nervo primario valido prominente, recto, 
apicem versus sensim attenuate ; nervis secundariis distinctis, subangulis 
70-80° orientibus, numerosis, basem versus abbreviatis et opproximatis, mar- 
ginem versus adscendentibus et attenuates ; nervis tertiariis inconspicuis. 
Ohs. — A leaf presenting a striking correspondence with leaves of species 
of Castanopsis. The genus named, whose species, with one single exception, 
* This species should be erased from the “ Flora Fossilis Artica.” The illustrations shown in vol. i, on PI. 
VIII, figs. 1-4, and PL XLVI, fig. 4 ; and in vol. vi, PL IV, fig 3, of this work, are representations of leaf fossils, which 
have a somewhat thicker texture, and stronger, prominent, less branched tertiary veins, than the leaves of the 
species named. These fossils were all derived from the locality of Atanckerdluk above referred to, and belong 
also probably to forms of the Quercus grcenlandica. In the Tertiary Flora of the Arctic Zone occur various 
beech remains which belong to other species ; but amongst them I have failed to discover those of the Fagus 
Dencalionis. 
