370 E. C. ANDREWS. 
It will be advisable in this case to make an assumption, 
namely, that all the Myrtacez and Leguminose, as known 
to-day, were in existence during certain assumed land 
conditions between Australia and the neighbouring lands 
as outlined herewith. 
(1) That New Zealand was connected to Australia by a 
long strip of land via Antarctica,’ while both countries 
were separated by a wide and deep sea to the north as at 
present. 
(2) That New Zealand was connected directly with the 
south-eastern portion of the continent. 
(3) That the two lands were connected by a relatively 
narrow tropical belt via New Guinea, the Solomon Islands, 
and the New Hebrides, as suggested by Hedley. 
Under the first complex assumption there would be no 
migration of either Leguminose or Myrtacez, with the 
possible exception of certain species of Leptospermum, 
Pultenzea, Bossizea and Beeckea, for climatic reasons. 
These genera are all represented at the present time in the 
colder parts of Tasmania. On the other hand, this would 
have afforded an excellent opportunity for the passage of 
types such as Hricacez, some Hpacrides, Campanulacee, 
and many genera of Composite. 
Under the second assumption New Zealand would be 
populated from Australia with Eucalyptus, phyllodineous 
types of Acacia, Daviesia, Swainsona, Pultenzea, Dillwynia 
and other forms, such as Beckea, but not by forms such 
as Sophora, Castanospermum, Dalbergia, Hntada and 
Afzelia. 
Under the third assumption, let us suppose that the soil 
was sandy and barren in nature. The Eucalyptus of then 
Corymbose type, many phyllodineous Acacias, Beeckea, 
2 Hedley (39). 
