CHART II 



FISHES 



Fishes are among the oldest forms of Vertebrate life. Their fossil 

 remains have been found in strata belonging to the upper part of the 

 Silurian division of the Palseozoic epoch. They may be broadly described 

 as cold-blooded Vertebrates, adapted to a strictly aquatic life, breathing 

 by means of gills, and with external lim.bs modified into fins. In the 

 above chart, emphasis in some orders has been placed upon forms familiar 

 to American waters. 



