398 MamMatia OF INDIA. 
viewed as traces of a foot composed of three toes in an ancestral form 
of the horse, which we shall discuss presently. In the tapir the hind 
foot is composed of three well-developed toes, corresponding to the first 
three toes in man, and in the rhinoceros both feet are provided with 
three toes, formed of the same three digits. In the extinct Palcotherium 
also the foot is constituted very much as in the rhinoceros.” 
FAMILY EQUIDAZE—THE HORSE. NE 
This family consists of the true horses and the asses, which latter also 
include the zebra and quagga. Apart from the decided external differ- 
ences between the horse and ass, they 
have one marked divergence, viz. that 
the horse has corns or callosities on 
the inner side of both fore and hind 
limbs, whilst the asses have them 
only on the fore limbs; but this is 
a very trifling difference, and how 
closely the two animals are allied 
is proved by the facility with which 
they interbreed. It is, therefore, 
proper to include them both in one 
genus, although Dr. Gray has made 
a separation, calling the latter Asznus, 
and Hamilton Smith proposed /- 
potigris as a generic name for the 
zebras. ; 
We have no wild horse in India; 
in fact there are no truly wild horses 
in the world as far as we know. 
The tarpan or wild horse of Tartary, 
and the mustang of South America, 
though de facto wild horses, are 
supposed to be descended from do- 
mesticated forms. In Australia too 
horses sometimes grow wild from 
being left long in the bush. These 
are known as Jdrumbies, and are 
generally shot by the stock farmer, 
as they are of deteriorated quality, and by enticing away his mares 
spoil his more carefully selected breeds. According to Mr. Anthony 
Trollope they are marvels of ugliness. 
Dentition of Horse. 
