32 PALEOZOIC FISHES OF NORTH AMERICA. 
niferous limestone was deposited have left here some traces of their exist- 
ence, and with proper study a catalogue, which should have a reasonable 
degree of completeness, could be made out of the fish fauna of the basin 
that in the Devonian age occupied the area between the Cincinnati arch, 
the Alleghany belt, and the Canadian highlands. Isolated specimens found 
elsewhere would supply anatomical details and serve for the reconstruction 
of entire individuals and thus of genera and species, but nowhere else, so 
far as my knowledge extends, can we get such a comprehensive view of the 
ichthyic fauna of the age. 
