president's address. 
643 
Stackhousie.e. 
LeguminostE. — Tribe Podalyriece, &c. Phyllodineous section of 
genus Acacia. 
Halorage^e. — Genus Haloragis. 
Myrtace^e. — Capsular Group. 
Ficoide^e. — Genus Mesembryanihemum and Aizoon. 
Stylidie^. 
Goodenovie^e. 
EpACRIDEjE. 
MYOPORINEiE. 
Labiate.— Tribe Prostanthereai. 
Proteace^e. 
Thymele^:. 
Casuarineje. 
Orchide^e. 
Juncace^e. — Tribes Xeroteoe and Xanthorrhece. 
Restiace^e. 
Wallace in his " Island Life," the first edition of which appeared 
in 1880, gives his views as to the point of origin of the Australian 
types. He places this in the south-west of Australia and 
assumes the possibility of extension of the land outside its present 
limits. The western half of Australia was cut off, he says, from 
the eastern half by the Lower Cretaceous Sea which ran right 
through the centre of what is now Australia, from north to south. 
He accounts for the existence of Eastern Australian forms of the 
typical vegetation by the assumption that they crossed this 
barrier in the same way as it is known that plants in course of 
time find means of leaping gaps of great width. This eastern 
portion is stated to have been in Cretaceous times of limited extent 
and to have derived most of its vegetation from the land surfaces 
to its north and north-west, in fact from the Indo-Malayan region. 
