existing Flora the B. Rojpalthra, Wall, (the analogue of the last named), 
from Nepaul, are the only ones which can he regarded as representative 
species. 
Locality and Horizon. — Dalton, near Gunning; in hard siliceous grit, 
reposing on Silurian rocks. 
Betula deilwentensis, sp. nou. 
Plate I, Fig. 14. 
Johnston, Notes, etc., Papers and Pro. P. Soc. Tasmania, for 1881 [Gth Plate], Fig. 10. 
Sp. Char . — B. foliis pctiolatis ovatis, aenminatis argute denticulatis ; 
nervatione craspedodroma; nervo primario distincto recto ; nervis secundariis 
suhangulis acutis egredientihus, rectis prominentihus, hasem versus approxi- 
matis. 
An ovate, petiolate, acuminate leaf, whose marginal character and 
venation point directly to the genus Betula. As regards hitherto published 
fossil species, 13. derwentensis approaches most closely the J3. Brongniarlii, 
Ett., and as regards those still living, the analogue of the lastnamed B. car- 
pinifolia , Sieb. & Zucc., from Japan. In the Tertiary Flora of North America, 
we find a similar species, the B. Goepperti , Lesq., which, as well as B. 
sachalinensis, Heer, from the fossil flora of Sachalin, may be regarded as 
representative species. 
Locality and Horizon. — One-tree Point and Carnclian Bay, Estuary 
of the River Derwent, Tasmania ; Upper Tertiary Leaf beds. 
Collection. — It. M. Johnston. 
Alnus Muelleri, sp. non. 
Plate I, Figs. 15-17. 
Sp. Char. — A. strobilis parvis gracilibus ellipticis, squamis ligncscen- 
tibus curvatis imbricatis ; foliis petiolatis ovatis, serratis ; nervatione craspe- 
dodroma ; nervo primario prominente ; nervis secundariis subangulis 50-00° 
orientibus, leviter arcuatis, simplicibus vel apice furcatis ; nervis tertiariis 
paucis distinctis inter se conjunctis. 
