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Show 1904.] TO THE SYSTEMATIC CHARACTERS OF MAMMALS. 147 EQUHLE (con.). Genus Equus E. equuleus. E. hemionus. E. onager. E. zebra. E. zebra burchelli. E. zebra grevyi. E. quagga. BOVID^E. Genus Bos B. taunts f Domestic, 20. \ Chillinghaxn Wild Cattle, 1. [ Corean Bull, 1. B. gaitrus 2 B: sondaicus 1 B. mindorensis 1 B. coffer 2 B. frontalis 1 B. dejyressicornis 1 B. bubalus 1 B. indicus 1 B. grunniens 1 B. ctmericctnits 2 Genus Ovibos 0. moschatus 4 ,, Connochastes ... C.taurinus 3 C. gnu 4 ,, Okapia 1 ,, Acldctx A. nasomaculcttus ... 1 ,, Saiga S. tcitarica 1 II. Whorls, Featherings, and Crests on the Neck, Trunk, and Limbs. Among the numerous modifications of the arrangement of hair found in Mammals in different species, whorls with their attendant featherings and crests are the most conspicuous. It is here proposed to enumerate those among them which exhibit the greatest degree of definition, and to suggest that some or all of them should be dealt with in the description of the species and genera in which they are found. It is not necessary here to enter into the theory of the origin of these phenomena or theix- interpretation, but only to take them as they are found on the pelage of hair-clad mammals and to show theix- taxonomic value. Among the large number of these phenomena found in various groups, many ax-e casual in their appearance, rudimentary, and uncertain. But there are many tlxe development of which is completed, and these constitute the class here considered. Wide investigation of them brings out the fact that a whorl is in process of further development, under conditions favourable to that development. Thus a whorl found alone may be looked upon as about to be projected into a feathering, and a whorl and feathering found together as about to be terminated, in a later- stage, by a ridge or crest which 10* |