16 
Proceedings of Royal Society of Edinburgh, [sess. 
resembles that of zebra-horse hybrids, conforms to the description 
of the mane given by Pallas, but differs from the short crisp mane 
of Gmelin’s specimen, and still more from that of the Moscow 
Tarpan, which, it will be remembered, reached a length of 45 cm., 
and hung to one side of the neck. In the dun Shetland dam, the 
mane lies close to the right side of the neck, but never exceeds a 
length of 35 cm. In the Scottish Tarpan the mane, from 15 to 
2 7 '5 cm. in length, is either nearly upright, or, as already mentioned, 
[■ G . A . Excart . 
A three-year-old wild horse (E. prejvctlskii) from the Great Altai Mountains, 
photographed September 1904 ; note erect mane and that the tail reaches 
the ground. 
arches outwards well clear of the neck (PI. II. 2, 3), whereas in a 
Fetlar (Shetland- Arab) pony of the same age, the mane reaches a 
length of 45 cm. and clings to the side of the neck. 1 The tail 
1 Whether the mane is long or short depends on two things : first, on the 
rate of growth of the hair ; and second, on how long the individual hairs 
persist. In the Celtic pony the mane hairs grow at the rate of nearly one inch 
per month ; in the forest variety they may persist until they reach a length 
of several feet ; even in Prejvalsky’s horse they may continue to grow until 
they are long enough to arch to one side of the neck, but eventually in the 
wild horse, as in zebras, these long hairs give place to short ones. 
