WALRUS 479 



WALRUS (Odoboenus rosmarus and 0. obesus) — continued. 

 TUSKS. 



NARWHAL (Monodon monoceros). 



The narwhal is the only member of the Cetacean or whale order 

 furnished with tusks. These are present only in the male, and generally 

 the left one alone is developed. Occasionally, however, both grow, as 

 exemplified in a specimen in the British, and a second in the Cambridge 

 Museum. A model of the animal is exhibited in the British Museum. 

 Distribution. — Arctic Seas. 



The following measurements refer to tusks : — 



