president's address. 643 



Stackhousie^. 



Leguminos^. — Tribe Podalyriecc, kc. Phyllodineous section of 

 genus Acacia. 



H ALORAGE.E. — Genus Haloragis. 



Myrtace.e. — Capsular Group. 



FicoiDE^. — Genus Mesemhryanthemum and Aizoon. 



Stylidie.e. 



GOODENOVIE^. 

 EPACRIDEiE. 



Myoporine.e. 



Labiat.e. — -Tribe Prostantherece. 



Proteace.e. 



Thymele.e. 



CASUARINEiE. 



Orchide^. 



JuNCACE^E. — Tribes Xerotea and Xa^ithorrhece. 



Restiace^. 



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. 



