The horse, its treatment in health and disease with a complete guide to breeding, training and management . SKELETON OF PROTOROHIPPUS FOSSIL ANCESTORS OF THE HORSE 511. Fig. til)7. — Upper Jlolars of Fossil Ancestors of the Horse rt, Hyracotherium; li, Mesohippiis; c, Anchitherium;rf, Protohippus; e, Hipparion; /, Horse — 1, dentine;2, enamel; 3, crnsta petrosa. The worn or exposed surfaces of the upper molar teeth of five of thesefossil animals and of thehorse are represented infig. G67; in order that thedevelopment from the com-paratively simple structureof the tooth of the Hyra-cotherium to
The horse, its treatment in health and disease with a complete guide to breeding, training and management . SKELETON OF PROTOROHIPPUS FOSSIL ANCESTORS OF THE HORSE 511. Fig. til)7. — Upper Jlolars of Fossil Ancestors of the Horse rt, Hyracotherium; li, Mesohippiis; c, Anchitherium;rf, Protohippus; e, Hipparion; /, Horse — 1, dentine;2, enamel; 3, crnsta petrosa. The worn or exposed surfaces of the upper molar teeth of five of thesefossil animals and of thehorse are represented infig. G67; in order that thedevelopment from the com-paratively simple structureof the tooth of the Hyra-cotherium to the compli-cated details of the teethof the Hipparion and horsemay be more readily fol-lowed, those figures aredrawn of the same size,although in nature thereis a gradual increase insize as well as in com-plexity. Of these examples the first three belong to the brachydont or short-crowned class, of whicha side view is given at «, fig. 668, whilst the teeth of the Protohipjjusand Hipparion show an ad^?ance towardsthe state of hypsodont or high-crownedteeth (6, fig. 668) which culminates inthe horse (c, in the same figure). Next in chronological order to t
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Keywords: ., bookcentury1900, bookdecade1900, booksubjecthorses, bookyear1906
