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VERTEBRATA. 
HIPPOPOTAMUS. 
THE HIPPOPOTAMID^. 
Of this family tliere is a single genus, HIPPOPOTAMUS, hippopotamus, and a single species, 
the Amphibious Hippopotamus, IT. amphibius. Of this the mnzzle is exceedingly thick and blunt, 
the head is very large, but the greater part of its bulk is made up of the facial bones, which are 
of enormous size when compared with the cranium. Tlie lower jaw is of immense size and 
power. Both jaws are armed with teeth of three different sorts, and some of these attain a large 
size. The incisors are four in each, jaw ; they arc of a cylindrical pointed form, the two middle 
