Abstract: of the coffin bone ...... 131 59.Chestnut (hock callosity) on right hind leg of pony (from Ridgeway) 132 60.Chestnut in right fore leg of Prejvalsky horse (from Ridgeway) 132 61 Chestnut (hock callosity) on right hind leg of Prejyalsky horse (from Ridgeway) . . .