119 
orientibus, tenuibus, rectis vel leviter curvatis, simplicibus ; ncrvis tertiariis 
tenuissimis, ramosis rarius simplicibus, reticulum valde cvolutum tenerrimum 
liaucl prominens includentibus. 
Ohs. — This species is intimately allied to the preceding one, but differs 
from it by the following characters : — The texture is more tender, the borders 
are doubly toothed, and the teeth are larger. The primary nerve and the 
secondary ones are comparatively thinner, the network is still more widely 
developed and its segments somewhat larger, as represented in Tig. 11 a, 
(enlarged) . Respecting these characters of the leaf, Fagus ohliqua, Mirb., from 
Chili* is the nearest analogue of the existing Tlora. 
I dedicated the fossil species in honor of Sir Joseph I). Ilooker, 
T.R.S., to whom Botany is much indebted for his meritorious works. 
Locality and Horizon. — Old Bose Valley Lead, with the preceding. 
Tagus Benthami, sp. nov. 
Plate X, Figs. 8-9, 9a. 
Sp. Char. — T. nuculis obtuse triquetris, sublevibus, f oliis membranaceis 
petiolatis, oblongo-ovatis, basi obtusis, apicem versus angustatis, margine 
insequaliter vel duplicato-dentatis, nervatione craspedodroma, nervo primario 
prominente, recto ; nervis secundariis pluribus subangulis 45-55° orientibus, 
distinctis rectis vel basi divergenti-arcuatis, simplicibus; nervis tertiariis 
tenuissimis, angulo subrecto insertis, fluxuosis, simblicibus vel ramosis inter 
se conjunctis, reticulo valde evoluto. 
Ohs . — Closely related on the one hand to Fagus Feronice, Ung., a species 
widely spread in the Tertiary Tormation; on the other to F. ferruginea, 
Ait., and F. sylvatica, Linn., now living. The described species agrees 
perfectly with Fagus Feronice respecting form and borders of the leaf, as well 
as nervation, especially with the variety F. Deucalionis, Ung. ; but it differs 
in the formation of the network, as discernible by comparing the magnified 
Tig. 9a. 
Fagus Benthami differs from F. IVilhinsoni and F. risdoniana,f by a 
more tender texture of the leaf and by its otherwise toothed borders, and 
especially from the latter species by the tertiary nerves, diverging rectangularly 
* F. australis, Goepp. , in Ettingshausen, Blattskelete tier Apetalen, Denksch. K. Akacl. Wissensch. Wien, 
Bd. xv, PI. VIII, figs. 3-5. 
+ See pp. 32 and 35. 
