. Natural history. Zoology. THE HOOFED MAMMALS. 153 dark central patch on the muzzle. The gland below the eye is small and concealed by hair, and the knees generally carry tufta of long hair. The springbok (&. euc/iore), remarkable on account of its habit of taking leaps in the air, and also from the enormous herds in which it was formerly found, differs from all the rest of the gazelles in having an erectile crest of long, stiff, white hair running down the back. Clarke's gazelle {AmmoAorcai clarkei), from Northern Somaliland, is distinguished by the regular upwards and forwards curvature
. Natural history. Zoology. THE HOOFED MAMMALS. 153 dark central patch on the muzzle. The gland below the eye is small and concealed by hair, and the knees generally carry tufta of long hair. The springbok (&. euc/iore), remarkable on account of its habit of taking leaps in the air, and also from the enormous herds in which it was formerly found, differs from all the rest of the gazelles in having an erectile crest of long, stiff, white hair running down the back. Clarke's gazelle {AmmoAorcai clarkei), from Northern Somaliland, is distinguished by the regular upwards and forwards curvature of the horns of the males, which are ringed in part at the base; the females being hornless. The skull is intermediate between that of the preceding and following genus. Waller's gazelle {LUliocranius walleri), which is an East African form ranging from tlie Kilimanjaro district to Somaliland, represents another genus by itself. The females are hornless, but in the males the horns are erect and curved forwards in a hook-like manner ; while both are characterised by the extraordinary neck, which gives to the animal almost the appearance of a small giraft'e. The genus is, however, best characterised by the solid structure of the skull. The small Somali Dorcatragus seems to be another aberrant gazelle. The next group of antelopes, which are common to Africa and Arabia, are best characterised by the upper molar teeth being structurally similar to those of the oxen. In these teeth the crowns are very tall and broad, so as to form an almost square section, while, on their inner side, they have a narrow additional column superadded to the four large normal cres- centic ones. All these antelopes-are of very large size, and both sexes are provided with long horns, which are placed innnediately over or behind the eyes, and are recurved, straight, or subspiral in form. The muzzle ia hairy, there is no gland below the eye, and the long, cylindrical tail is tufted at the extremity. In the
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