312 SIRENIA. 



Another species numerous on the coasts of Australia is HaUcore 

 australis. It is stated to be bluish on the back, with a white breast 

 and belly. It grows to 18 or 20 feet in length. The oil obtained from, 

 the fat is highly prized. 



The other herbivorous Cetacea are the Manatis (Manatus, Cuvier). 

 There ai'e two or three species, from the mouths of rivers in Africa and 

 America. They have vestiges of nails on their swimming-paws, and 

 the adults have no incisors. 



The Stellerines [Rytlna, Illiger) are now extinct. 



