138 THE WANDERINGS OF ANIMALS [OH. 



to Germany and Switzerland. Przewalsky's horse 

 in Central Asia is the only really wild horse still in 

 existence. 



Dugongs and Seals. 



The earliest Sirenians are known from the Eocene 

 of Jamaica and Egypt, others from Oligocene and 

 Miocene of France and Italy, and from Pliocene 

 North-West America and Japan. They are a strong 

 support of the existence of a transatlantic bridge, along 

 the northern coast of which they lived in early 

 Tertiary times, and of an Atlantic-Mediterranean- 

 Indian sea. The present distribution of the few 

 recent kinds still bears this out. Manatis inhabit 

 the coasts of the Antilles, Central and South America, 

 and Africa from the Senegal to Natal, ascending also 

 the big rivers on either side. Dugongs live along the 

 coasts of the Indian Ocean, from Mozambique to the 

 northern coasts of Australia. Rhytina, Steller's sea- 

 cow, was North Pacific, exterminated in 1768. 



Seals, to mention another order of marine mam- 

 mals. The walrus is polar ; during the glacial epoch it 

 extended down to the coast of France. Eared seals 

 are Northern Pacific, from Japan to Mexico, and with 

 a wide equatorial interval on both coasts of South 

 America, Southern Australia, New Zealand and Ant- 

 arctica. The earless seals have a still wider range; 

 around the antarctic continent and southern islands, 



