It may, however, be observed, that it has been proposed to divide it into two distinct genera, the one containing the Horse alone, and characterized by the flowing tail uniformly covered with long hair, by the absence of a line of darker coloured hairs along the back, and by the presence of callous protuberances on the hind legs as well as on the fore: the other comprehending the Asses and Zebras, and distinguished by the tail having a brush of long hairs at its extremity only, by the presence of the dorsal line, and the absence of the protuberances on the posterior legs. Such a division, resting as it does on striking but not very essential differences, may fairly be admitted for the purpose of separating the genus into sections; but can hardly be regarded as founded on characters of sufficient importance to disunite so well marked and strongly connected, as well as so limited, a group. In the same paper in which this new arrangement was proposed, the beautiful animal which we have now to describe was first specifically distinguished by Mr. Gray from the Common Zebra, with which it had previously been confounded, and characterized by him under the name of the Asinus Burchellii. Still there exists so much confusion between the two Zebras, many naturalists falling into the same error with Mr. Burchell, who first remarked the distinction between them, and regarding the present animal as the Zebra of zoologists, and the common one in reality as the new species; while others have absolutely counterchanged a part of the characters of each, and thus made confusion worse confounded; that we cannot do better than describe with some little detail the markings of the individual now before us.