CONTENTS Xlll 



Order CETACEA Continued. 



Family Balaenidae : Right whales 499 



Family Balaenopteridae : Fin whales 513 



Order SIRENIA : Sea-cows 528 



Family Dugongidae: Dugongs 528 



Family Hydrodamalidae 535 



Family Trichechidae : Manatees 538 



BIBLIOGRAPHY 553 



INDEX . .589 



