. The museum of natural history, with introductory essay on the natural history of the primeval world : being a popular account of the structure, habits, and classification of the various departments of the animal kingdom, quadrupeds, birds, reptiles, fishes, shells, and insects, including the insects destructive to agriculture . rupeds form the third family of the order Pachyder-mata; but, by general consent, it is admitted tliat thepresent group is worthy of being separately treated inthe manner here proposed. In Professor Owens sys-tem, the solidungulates constitute a subdivision of hisodd-
. The museum of natural history, with introductory essay on the natural history of the primeval world : being a popular account of the structure, habits, and classification of the various departments of the animal kingdom, quadrupeds, birds, reptiles, fishes, shells, and insects, including the insects destructive to agriculture . rupeds form the third family of the order Pachyder-mata; but, by general consent, it is admitted tliat thepresent group is worthy of being separately treated inthe manner here proposed. In Professor Owens sys-tem, the solidungulates constitute a subdivision of hisodd-toed ungulates or Perissodactyla. The membersof this order are at once characterized by the circum-stance of tlieir possessmg, or rather appearing topossess, only a single toe, which is incased in a solidbox-like hoof; there are, however, on eitlier side oftliis large central toe, rudimentary digits, in the con-dition of two splint-like bones, corresponding to thesecond and fourth metacarpal and metatarsal bones oftlie human extremities. Another distinguishing featureis seen in the dentition, which is made up of fortyteeth; twelve of these are incisors, equally dividedabove and below; four are canines, the upper beingalmost invariably absent in tlie female ; the remainingtwenty-four being molars, whose crowns are flat and. SkuU of the Horse. square-shaped, and marked by four crescentic folds ofenamel—those of the upper jaw having a small addi-tional fold at the inside. If the accompanjong figurebe examined it wUl be noticed that a considerable inter-space exists between tlie incisors and the anteriorgrinders (fig. 66); it is through tliis vacuity that the bit is introduced for the purpose of controlling andVol. I directing the horses speed. The stomach of tlie soli-dungulates is simple and undivided; the coecum andlarge intestines being extremely capacious, and the gall-bladder entirely wanting. Finally, it may be remarkedtliat fossil solidungulate remains have been foimd int
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