Quadrupeds. 
THE WALRUS, MORSE, OR SEA-COW. 
(Tricliechus Hosmarus.) 
This very curious animal is nearly allied to the Seal, bul 
is of much greater size, being frequently eighteen feet 
in length, and from ten to twelve feet in girth. The 
head is round, the eyes are small and brilliant, and the 
upper lip, which is enormously thick, is covered with 
pellucid bristles, as largo as a straw. The nostrils are 
very large, and there are no external ears. The most 
remarkable part of the Walrus is, however, his two large 
tusks in the upper jaw ; they are inverted, the points 
nearly uniting, and sometimes exceed twenty-four inches 
in length ! the use which the animal makes of them is 
not easily explained, unless they help him to climb up 
the rocks and mountains of ice among which he takes up 
his abode, as the parrot employs his beak to get upon his 
perch. The tusks of the Walrus are superior in dura- 
bility and whiteness to those of the elephant, and, as 
they keep their colour much longer, are preferred by 
dentists to any other substance for making artificial 
teeth. 
The Walrus is common in some of the northern seas, 
and will sometimes attack a boat full of men. They are 
gregarious animals, usually found in herds of from fifty 
to one hundred or more, sleeping and snoring on the 
icy shores ; but when alarmed they precipitate them- 
selves into the water with great bustle and trepidation, 
