494 HYRACOTHERIUM. 
PACHYDERMATA. HYRACOTHERIUM. 
Fig. 170. Fig. 171. 
g 
Last molar. Third premolar. 
Nat. size. Eocene sand, Kyson. 
THE CUNICULAR, or RABBIT-LIKE HYRACO- 
THERE. Ayracotherium Cuniculus. 
Hyracotherium Cuniculus, Owen, Annals of Natural History, September 
1841. Report of British Association, 1843, 
p- 22/7. 
In the eocene sand underlying the red crag at Kingston 
or Kyson in Suffolk, from which the remains of Quadru- 
mana,* Cheiroptera,- and Marsupialia,t have already been 
obtained, Mr. Colchester has likewise discovered the teeth 
of other small Mammalian animals, some of which are refer- 
able to the small Pachydermal extinct genus Hyracotherium, 
established on the nearly entire cranium from the London 
clay, described in the preceding section. 
The teeth from Kyson are three true molars and one of 
the false molars, all belonging to the upper jaw. The 
crowns of the true molars present the same shortness in 
vertical extent, the same inequilateral, four-sided, transverse 
section, and nearly the same structure, as in Hyracotherium 
leporinum ; the grinding surface also supports four obtuse 
pyramidal cusps, and is surrounded by a well-developed 
ridge, produced at the anterior and outer angle of the 
crown into a fifth small cusp. 
These teeth are, however, of smaller size, as will be seen 
%* Ante, Dp. 3. + Ante, p- lyfe sie Ante, Pp (fl 
