FOSSIL HORSE. 395 
quadruped of similar size. The last phalanx, or hoof-bone, 
is an equally characteristic bone ; a reduced view of the 
upper and anterior surface of one of these, obtained with 
Fig. 155. 
Fig. 156. 
Astragalus of fossil Horse, § nat. Hoof-phalanx of fossil Horse, 4 nat. 
size, Oreston. size, Oreston. 
the other bones of the hind-foot from the same fissure at 
Oreston, is given in fig. 156. 
The contemporary species associated with the Equus 
fossilis in the Oreston Caverns, but imdicated to be distinct 
by the structure of the molar teeth above described, I have 
called, in my ‘ Report on British Fossil Mammalia,’* Hguwus 
plicidens, on account of the characteristic plications of the 
enamel. I have not yet seen any teeth from British strata 
having the well marked characters of those of the Hippo- 
therium of Dr. Kaup (Equus caballus primigenius of M. H. 
v. Meyer) ; but the teeth of the extinct slender-legged 
Horse, or Hippothere, transmitted by Capt. Cautley to the 
British Museum, are identical with those of the above 
species from the European miocene. 
* ¢ Trans. Brit. Association,’ 1843, p. 231. 
