CHAPTEE III. 



ON DISTRIBUTION. 



As regards the Geographical Distribution of Genera, 

 we find, among fresh-water fishes, that the Genera 

 are confined within much narrower limits than are 

 the Families. 



To take a few instances. 



Genus Barbus. Temperate and tropical parts of 

 the Old World —Europe, Asia, Africa, East Indian 

 Archipelago. 



Genus Labeo. Tropical regions — Africa, and the 

 East Indies, Java, Syria. 



Genus Discognathus. Mountain streams, Syria, 

 Persia, India, Ceylon. 



Genus Crossochilus. East Indies, Java and Sumatra. 



Genus Sclerognathus. North America and North 

 China. 



Genus Cyprinus. Temperate parts of Europe and 

 Asia. 



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