414 Dawson—Bearing of Devonian Botany on 
Middle, and Upper Carboniferous, all more or less distinct from 
each other, ie i i ison 1 
eastern regions where the great limestone-producing subsidences 
were unfelt, and, on the other hand, are absent in Ohio, where 
the subsidences and marine conditions were almost at a maxi- 
mum. 
cilie types. Of these only four reappear in the Carboniferous 
under identical species, but no less than twenty-six reappear 
ler representative or allied forms, some at least of vin? 
i ed 
urther, a very poor flora, including oe 
Erian flora of America, as well as the Carboniferous, requires 4 
‘horough comparison with that of Europe before general co 
be safely drawn. In the meantime I may indicate the : 
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