MAMMALIA. 
121 
to the withers eleven feet. Found fossil in North America. 
No living species of this genus have been discovered. 
Family II. —True Pachyderma, 
Most of them with three kinds of teeth; two, at least, in 
others ; feet with four or two toes. 
Genus 4. — Hippopotamus — Linnceus. 
Generic Character _Incisors canines J-J, grinders 7-7; to¬ 
tal 40. Upper incisory teeth thick, short, and conical, bent in¬ 
ward, the lower ones cylindrical, directed obliquely forward, the 
intermediate being the strongest; the canines greatly deve¬ 
loped, forming strong tusks, which are obliquely truncated ; the 
three or four first grinders are conical and simple; head thick 
and square; muzzle large and obtuse ; eyes and ears very small ; 
body very thick and heavy; legs short; feet with four toes ; 
with two ventral mammae ; skin without hair; tail short, with 
hairs near its point. 
Hippopotamus amphibius. —The Hippopotamus. 
Plate XXII. fig. 4. 
Skin dark blackish-brown ; body very heavy ; legs short; ears 
placed far back, and very small; end of the jaw very wide. 
Thirteen feet long. Inhabits the larger rivers of Africa. 
Genus 5. —Sus.— Linnceus. 
Generic Character .—Incisors * or canines J-J, grinders ?-7 ; 
total 42 or 44. The lower incisory teeth directed obliquely for¬ 
ward, the upper ones conical; the canines protruded, and bent 
upwards ; grinders simple and tuberculous; nose elongated, car¬ 
tilaginous, and furnished with a particular bone to the snout; 
feet with four toes, the two middle ones only touching the 
ground, furnished with strong hoofs; body covered with bristles; 
mammae twelve. 
K 
