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north to 35° south latitude, and from 50° to 79° west longitude, providing a continuous north and south waterway of more than three thousand miles, and an east and west course of over two thousand miles, and embracing the Orinoco basin, the Amazon basin and the La Plata basin, draining over 3,000,000 square miles of territory, or an area about equal to that of the United States, exclusive of appendages.

There are found in the rivers of South America representatives of many marine fishes. Soles, swellfish, stingrays, needlefishes, mullets,