28 Transactions. 
western division passing through Burma to Western Australia, while 
the other, receiving in China an influx of American forms arriving by the 
circumpacific channel, passed south-eastwards towards the then Tasman 
Sea. The complete absence of Devonian marine beds in New Zealand and 
New Caledonia has led the writer to suggest the land-boundaries in map 5. 
Considerable changes occurred in the closing parts of Devonian time. 
"The sea had withdrawn from Western Australia, Queensland, and the 
south-eastern gulf, but now emerged from the eastern gulf and trans- 
gressed widely, covering almost the whole of New South Wales, flooding 
over the eroded but still uneven surface of the regions which had been 
folded at the close of Middle Devonian times, and depositing a series of 
conglomerates, sandstones, and shales, which are caleareous only near the 
margin of the eastern gulf, where they also reach their maximum thick- 
Vis nature of this transgressing fauna is of interest. It has frequently 
Qu ates ae gt how cosmopolitan is the Upper Devonian fauna, an 
resent in New South Wales. Never- 
andae than Ale pee 
ence that the periodici : : ү 
and American el at ан faunal migrations between the Asiatic 
ever, In opposition to Schuchert’ hesis 
th : uchert’s (1910) hypothe 
at the Portage-Chemung fauna agro directly across the Atlantic from 
| u 1 (1898) that it came across the Arctic 
Apo spread south-castwards by way of the cordilleran sea, it would follow 
