DEVONIAN AND OLD RED PERIOD. I51 
tain, and it contains no indubitable marine fossils. It has 
been now shown, however, that the marine Devonian strata of 
Devonshire and the continent of Europe contain some of the 
most characteristic of the Old Red Sandstone fishes of Scot- 
land ; whilst the undoubted marine deposit of the Corniferous 
limestone of North America contains numerous shark-like and 
Ganoid fishes, including such a characteristic Old Red genus 
as Coccosteus. ‘There can be little doubt, therefore, but that the 
majority of the Devonian fishes were truly marine in their habits, 
though it is probable that many of them lived in shallow water, 
in the immediate neighbourhood of the shore, or in estuaries. 
The Devonian Ganoids belong to a number of groups; and 
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it is only possible to notice a few of the most important forms 
here. The modern group of the Sturgeons is represented, 
