1914-15.] The Baleen Whales of the South Atlantic. 21 
The comparison of the tympano-petrous bones from the Balsenopteridse 
in the South Atlantic with those from animals captured in the North 
Atlantic warrants the statement, that differences do not exist between them 
which can be regarded as specific, notwithstanding that their habitats are 
so widely separated. 
Similarly, the smaller Right Whale, Baloena australis, which frequents 
the temperate waters of the South Atlantic, so closely resembles the 
corresponding Right Whale, Balcena biscayensis, of the North Atlantic, 
that they are obviously the same species.* On the other hand, the larger 
Greenland Right Whale of the Arctic Ocean, Balcena mysticetus, so far 
as we at present know, has no representative in the Antarctic. 
* See my memoir on Balcena biscayensis in Trans. Roy. Soc. Edin., vol. xlviii., 1913. 
{Issued separately December 4, 1914.) 
