Archive image from page 754 of The cyclopædia of anatomy and. The cyclopædia of anatomy and physiology cyclopdiaofana0401todd Year: 1847 SOLIPEDA. 733 siderable interval ; and a similar interspace also exists, but to a less extent, in the lower jaw. The molar teeth of the horse are of a pris- matic form, their grinding surfaces being marked with four crescents of enamel in the lower jaw, and with five in the upper: these crescendo patches in the upper jaw have their concavities turned outwards, but in the lower jaw in the opposite direction. The teeth of the horse are, moreover, distinguishab
Archive image from page 754 of The cyclopædia of anatomy and. The cyclopædia of anatomy and physiology cyclopdiaofana0401todd Year: 1847 SOLIPEDA. 733 siderable interval ; and a similar interspace also exists, but to a less extent, in the lower jaw. The molar teeth of the horse are of a pris- matic form, their grinding surfaces being marked with four crescents of enamel in the lower jaw, and with five in the upper: these crescendo patches in the upper jaw have their concavities turned outwards, but in the lower jaw in the opposite direction. The teeth of the horse are, moreover, distinguishable from those of the ox and some other Ruminants, which they resemble in their general appear- ance, from the circumstance that, in the latter, the crescentic patches of enamel are arranged in pairs, and are placed parallel to each other ; whilst in the horse they are situated alter- nately, the first of the inner margin of the tooth corresponding to the interval between the two of the outer margin. Professor Owen observes, that the cha- racter by which the horse's molars may be best distinguished from the teeth of other Herbivora corresponding with them in size, is the great length of the tooth before it divides into fangs. This division, indeed, does not begin to take place until much of the crown has been worn away ; and thus, except in old horses, a considerable portion of the whole of the molar is implanted in the socket by an undivided base. The deciduous molars have shorter bodies, and sooner begin to develope roots ; but in these, or in an old permanent molar with roots, the pattern of the grinding surface, though it be a little changed by partial obliteration of the enamel folds, yet generally retains as much of its cha- racter as to serve, with the form of the tooth, to distinguish such tooth from the permanent molar of a Ruminant. A knowledge of the structure and history of the teeth of the horse becomes addition- ally important, from the circumstance that it is f
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