G6 
RUAMEEjE. 
POMADERBITES BaNKSII, Sp. 110V. 
Plate VI, Fig. 4. 
Sp. Char . — P. foliis membranaceis, lanceolatis, basi ovata obtusi- 
usculus, apicem versus angustatis, margine integerrimis ; nervatione campto- 
droma ; nervo primario debili, recto, apicem versus attenuato ; nervis sccun- 
dariis tenuibus, subangulis 30-40° orientibus, marginem adscentibus, 
simplicibus, basilaribus oppositis, religuis alternis ; nervis tertiariis tenu- 
issimis approximatis, transversis. 
Ohs. — A leaf with well-preserved venation, and so distinguished by 
several well-marked characters, that there is no difficulty in determining at 
least the family to which it belongs. It reveals a delicate membranous tex- 
ture, has a lanceolate form, ovate at the base, and gradually narrowed towards 
the apex, with the margin entire. The venation is camptodromic, and 
presents very remarkable characters. The midrib, in accordance with the 
delicate nature of the leaf, is very thin ; the secondary veins issue at very 
acute angles, and ascend abruptly towards the margin, all undivided ; the 
basal ones are opposite, and somewhat longer than the others. The tertiary 
veins are very fine, approximate, and transverse (compare the enlargement 
of the venation, Pig. 4a). These characters point most clearly to the family of 
the Rhamnece , where in the genera Eerchemia , Eomaclerris , and Rhamnus we 
find species whose leaves possess more or less completely the peculiarities of 
the described fossil. The leaves of the Australian genus JPomctderris, in 
their lanceolate form and forwardly ascending secondary veins, correspond 
especially to our fossil (compare Pomaderris ferruginea , Sieb., Ettingshausen, 
Blattskelete der Dicotyledonen, p. 1GG, fig. 155, which shows basal secondary 
veins also). But Pomaderris differs from the fossil so widely in the coriaceous 
consistence of the leaves, and the more distant, stronger, and not transverse 
tertiary veins, that it cannot be included in that genus. The species of Ecr- 
cliemia have, it is true, more delicate leaves and fine approximate transverse 
tertiary veins, but the prominent basal veins are altogether wanting, which is 
also the case in the leaves of Rhamnus. The leaves of Gouania show more or 
less ascending secondary veins with transverse tertiary veins, but its basal 
secondary veins arc more strongly developed, and have prominent exterior 
veins, which arc entirely wanting in the described fossil; besides, these 
leaves arc never lanceolate, but broad, ovate, or rounded, and cordate at the 
base. The Ithamneie have numerous representatives in the Tertiary Plora. 
