424 HYRACOTHERIUM. 



PACHYDERMATA. HYRACOTHERIUM. 



Fig. 170. Fig. 171. 



Last molar. Third premolar. 



Nat. size. Eocene sand, Kyson. 



THE CUNICULAR, OB RABBIT-LIKE HYRACO- 

 THERE. Hyracotherium Cuniculus. 



Hyracotherium Cuniculus, OWEN, Annals of Natural History, September 



1841. Report of British Association, 1843, 

 p. 227. 



IN the eocene sand underlying the red crag at Kingston 

 or Kyson in Suffolk, from which the remains of Quadru- 

 mana* Cheiroptera^ and Marsupialia.^ 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, p. 3. f Ante, p. 17. I Ante, p. 71 



