438 
president’s address. 
Correspondence in North and South Conditions, 
or, “ Bipolarity,” and Bipolar Faunas. 
There is an interesting question too, in reference to the littoral 
and shallow water fauna and flora of the Antarctic lands as compared 
with the Arctic. 
The Sirenia are represented in the south by Halicore australis, 
off the coast of Queensland, Australia, 30° only south of the 
equator, whilst Rhytina gif/as ( = R. Stelleri) occurs in peat-deposits 
on Behring Island, and was living in numbers around its shores 
as lately as 1750, 60° north of the equator. Probably in earlier 
times Halicore, or its allies, may have extended southwards to the 
shores and islands of the Antarctic lands.* 
Of the Cetacea, the genus Balasna is represented in the Arctic 
Seas by B. mysticetus , B. biscayensis occurring in the North 
Atlantic and B. japonica in the North Pacific, the South Atlantic 
having Balcena australis, and the South Pacific B. antipodarum 
and B. novce-Zealandice. 
Of the Pinnipedia, Seals and Walruses, the Northern Sea Lion, 
Otaria stelleri, the largest of the genus, ten feet long, from the 
North Pacific is represented by Otaria jubata, the Patagonian 
and Southern “ Sea Lion,” and some other corresponding species as 
0. californiana (California) and 0. ursina, North Pacific, Prybiloff 
Island ; 0. pusilla, Cape of Good Hope ; 0. forsteri and others 
from Australia. The Walrus ( Trichechus ) is only found in the 
Arctic Seas, North Atlantic, and North Pacific Oceans. 
The true Seal (Phoca) is common to the North Atlantic and the 
North Pacific Coasts, but does not occur in the Southern Ocean. 
“ The Sea-Leopard ” Ogmorhinus occupies the Antarctic and 
Southern temperate seas. 
The Elephant Seal ( Macrorhinus ) or Sea Elephant, the largest 
of the whole family ( twenty feet long), was formerly abundant in 
the Antarctic Seas and also found on the coast of California. 
* Acoording to Ross and many other explorers, great banks of Laminaria 
and other sea-weeds, similar to those around Behring Island, on which the 
Rhytina fed, abound in tho Soutli Polar Seas. 
