144 ON THE HUON PINE, &c. 
If we divide the regions which these Conifere inhabit into 
four, namely Australia, New Zealand, South America and 
South Africa, it will appear that they are very unequally 
diffused, and. that their relative abundance is not regulated 
by the extent of surface, which might be expected to be the 
case with a group composed of peculiarly local species. Only - 
one of the genera is common to them all, Podocarpus, it 
is in all respects the most widely diffused genus of Conifere, 
as it is one of the most extensive. Araucaria comes next, 
being found in three of the regions, Australia, New Zealand," 
S. America. Thuja has been detected in two only, America 
and New Zealand; Callitris, including Pachylepis, in Aus- - 
tralia and Africa; Dacrydium and Phyllocladus in Australia — 
and New Zealand. Juniperus is confined to America, if. 
indeed it really exists in the Southern Hemisphere, and 
Arthrotaxis and Microcachrys to Tasmania. 
In conclusion, I shall arrange the genera in the order of | 
their relative abundance in the countries specified above. 
I. Ausrrauia is by far the richest, containing as it does - 
seven genera and probably twenty-six species, thus: Cal- 
litris 12, Podocarpus 6, Arthrotaxis 3, Araucaria 2, Micro- 
cachrys 1, Dacrydium 1, Phyllocladus 1. It also exhibits the 
most striking coniferous vegetation, and is the only country 
possessing any two peculiar genera. 
II. New ZEALAND contains of Podocarpus 6, Dacry- 
dium 3, Thuja 1, Phyllocladus 1, Dammara 1, Araucaria 15 
six genera and thirteen species. In Phyllocladus and Dacry- - 
dium it partakes of the Flora of Australia, and in Zhuja that 
of America. | 
HI. America ; Podocarpus 4, Thuja 2, Araucaria 2, 
Juniperus 1 ;? four genera and eight or perhaps nine species. 
IV. Arrica; Podocarpus 2, Callitris (Pachylepis) perhaps — 
3, Juniperus 1? three genera and six species; the affinity tO 
the Conifere of Australia, through Callitris, is manifest. — 
From this it appears that the number of species 
* [ include Norfolk Island in the New Zealand division. 
