Agricultural geology . s, and in support of this view he cites the work of DouglasCarruthers^, who has shown that the tribes of Central Asia,both in ancient and modern times, have constantly crossed 1 Elwes, Scottish Naturalist, 1912. 2 Lydekker, The Sheep and its Cousins, London, 1912.^ Carruthers, Unknown Mongolia, London, 1913. 324 THE GEOLOGICAL HISTORY [CH. their domesticated ewes with wild rams of the ArgaU or Ammontype. Ewart adduces further evidence based on the examina-tion of remains from Pleistocene deposits, on a comparisonbetween the skeletons of wild species and primitive and mod
Agricultural geology . s, and in support of this view he cites the work of DouglasCarruthers^, who has shown that the tribes of Central Asia,both in ancient and modern times, have constantly crossed 1 Elwes, Scottish Naturalist, 1912. 2 Lydekker, The Sheep and its Cousins, London, 1912.^ Carruthers, Unknown Mongolia, London, 1913. 324 THE GEOLOGICAL HISTORY [CH. their domesticated ewes with wild rams of the ArgaU or Ammontype. Ewart adduces further evidence based on the examina-tion of remains from Pleistocene deposits, on a comparisonbetween the skeletons of wild species and primitive and modernbreeds, and on cross-breeding experiments, in support of theview that the Scottish Blackf aced Sheep, the Merino, and possiblyother British breeds, are in part descended from the Argali^. After the beginning of the Ice Age, when 0. savini becameextinct, there were no sheep in Britain. They reappeared withthe coming of the Neohths, who, as we have already seen,brought with them their domestic animals, and among these. Fig. 51. Skull of Dorset Ram showing horns of Ammon type. (From Ewart.) were sheep of the Mouflon and Urial types. Moreover, Ewarthas shown that some of their sheep had horns like those of a smallAmmon, and he points out further that the remains of sheepfound in the alluvium of the Thames Valley show a markedresemblance to the Argali type. The Pig The family to which the Pig belongs is the least altered ormost primitive of the hoofed animals. They differ from horses,sheep and oxen in having the ulna of the forelimb and the Ewart, loc. cit. XVII] OF THE DOMESTIC ANIMALS 325 fibula of the hindlimb as separate bones, distinct from the radiusand the tibia. The bones of the wrist and ankle (carpals andtarsals) are not fused together. The molar teeth are bunodont,that is to say their crowns bear simple or roundish bosses ortubercles, and not crescent shaped structures as in Ruminants,or complicated irregular ridges as in horses. The canine teethare well developed and
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