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Theories sufficient have been hazarded, and books written without number from the days of old Aristotle, who arranged them in three great divisions, the Cetaceous, the Cartilaginous, and the Spinous; down to Gmelin, who divided them into six orders, the Apodal, the Jugular, the Thoracic, the Abdominal, the Branchiostagous, and the Chondropterygious.
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