25 
margin and venation point more clearly to a birch leaf. Finally, as the 
fruiting cones of the A. gracilis occur in the tertiary strata of Iceland, no 
doubt can be entertained that the leaf remains of this alder would also be 
found. 
With reference to the Alnus americcma* the analogue of A. Muelleri 
in the North America Tertiary Flora, I would like to add the following: 
The leaf designated as Betnla Goepperti by Lesquereux in his “ Contribu- 
tions to the Fossil Flora of the Western Territories ” (Part IT, PI XVII, figs. 
23 and 23a) has a doubly dentate margin, and differs in this, as well as to 
some extent in the venation, from the leaf fossils of the species named. It 
betrays more the habit of an alder leaf than of a birch leaf, namely, as 
regards the broadly ovate form and the somewhat unequal base, and points 
to the existence of a second species of alder in the Tertiary Flora of North 
America. So far, only one alder has been published from this flora, which 
cannot be distinguished from the Alnus Kcfersteinii of the European Tertiary 
Flora, whilst the second species referred to, whose diagnosis is appended 
below, is most nearly allied to the A. gracilis, from which it differs in its 
dentate margin and its more approximate tertiary veins. 
Locality and Horizon. — Risdon, Tasmania ; in yellow Travertin of 
Upper Tertiary agc.f One-tree Point and Pipeclay Bluff, Carnelian Point, 
Estuary of the Fiver Derwent, Tasmania ; Upper Tertiary Leaf beds. Dalton, 
near Gunning; in hard siliceous grit, reposing on Silurian rocks. 
Collections. — British Museum (Natural History Branch), and R. M. 
Johnston, respectively. 
CUP CL1F I AU U. 
Querctjs IIookeri, sp . nov . 
Plate II, Figs. 5 and 0. 
Sp. Char. — Q. foliis coriaceis petiolatis, oblongis vel lanceolatis 
acuminatis integerrimis ; nervatione camptodroma; nervo primario valido, 
* Alims Americana, sp. nov. Foliis rotundato-ovatis, basi subobliquis, apice acuminatis, margine duplicato- 
dentatis ; nervatione craspedodroma ; nervo primario basi prominente, apicem versus attenuato ; nervis secundariis 
subangulis 30-40° orientibus, distinctis subarcuatis, margincm versus valde attenuatis ; nervis tertiariis angulo 
recto insertis, tenuibus approximate, inter se conjunctis. In a Tertiary formation at Evanston, Wyoming, 
North America. 
t [With regard to the age of the Yellow Travertin met with near Hobart at Geilston, Risdon, and other 
places, Mr. R. M. Johnston believes it to be the equivalent of “ the extensive fluviatile and lacustrine formations 
in Australia, particularly at Haddon, Bacchus Marsh, Malmsbury Gulgong, Richmond River, 
Orange, &c.” (Papers and Pro. II. Soc. Tasmania for 1879 [1880], p. S3). — R.E., jnr.] 
11«G7-8S E 
