Fig. 9a. Middle metacarpal (front cannon-bone) of Eric, a 36·5-inch Shetland pony; length, 143 mm. (5·6 inches), width at middle of shaft, 26 mm. In Eric the reduction or dwarfing of the front cannon-bones is estimated at 1 inch. Half nat. size.
Fig. 9b. Middle metacarpal of the Miocene 3-toed (36-inch?) horse Protohippus sejunctus; length, 177 mm. (6·9 inches), width, 21 mm.—i.e., 1·3 inches longer than in Eric. Half nat. size.
Fig. 9c. Middle metacarpal of Hypohippus, the (40-inch?) Miocene 3-toed “forest” horse of Montana and South Dakota; length, 215 mm. (8·4 inches), width, 22 mm.—i.e., 2·8 inches longer than in Eric. Half nat. size.
Fig. 10. Bones of fore and hind foot (half nat. size) of Eohippus (fig. 12). After Marsh.
Fig. 11. Bones of fore and hind foot (half nat. size) of Orohippus (fig. 13). After Marsh.
Fig. 11a. Bones of the three front toes (II., III., and IV.) of Neohipparion, the 10-hands American Miocene desert horse with deer-like limbs. In this ancient race-horse the II. and IV. toes are very much shorter than in Hypohippus (fig. 20), a late Miocene “forest” horse.
Fig. 11b. Engraving of a small-headed horse made during the Early Stone Age in the Combarelles Cave, France. The short face, small ear, and flowing mane suggest a race to which Shelties may be related. One-fourth nat. size.
Plate IV.
