The third or penultimate molar of the Ailuropus is larger and thicker than the preceding, divided in five distinct lobes—three outer ones in a line, and two less projecting ones within.
The last premolar is remarkably large; it is much larger behind than in front, and its crown is divided into six lobes, of which five are very strong; the three external ones are much developed and trenchant, the centre one being the highest and of a triangular shape. Of the internal lobes, the first one is almost as large as the external ones; the second is very small, almost hidden in the groove between the last mentioned; and the third, which is very large, rounded and placed obliquely inwards in front, and outwards behind. Professor Milne-Edwards remarks that he knows not amongst the carnivora a similar example of a tooth so disposed. That of Ailurus shows the least difference, that is to say it is nearest in structure, having also six lobes, but more thick-set or depressed.
The true molars are remarkable for their enormous development: the first is almost square, with blunt rounded cusps, four-fanged, and presenting a strange mixture of characteristics, in its outward portion resembling an essentially carnivorous type, and its internal portion that of molars intended to triturate vegetable substances. Amongst bears, and especially the Malayan bears, this character is presented, but in a less striking degree; the panda resembles it more, with certain restrictions, but the most striking analogy is with the genus Hyænarctos.
The last molar is peculiar in shape, longer than broad, and is tuberculous, as in the bears, but it differs in this respect from the pandas, in which the last molar is almost a repetition of the preceding one, and its longitudinal diameter is less than its transverse.
In the lower jaw the first premolar, instead of being small and tuberculate, as its corresponding tooth in the upper jaw, is large, double-fanged, trenchant and tri-lobed, resembling, except for size, the two following ones. The second is not inserted obliquely like its correspondent in the upper jaw, its axis is in a line with that of its neighbours; tricuspidate, the middle lobe being the highest. The third premolar is very large, and agrees with its upper one, excepting the lobule on the inner border.
The first true molar is longer than broad, and wider in front; the crown, with five conical tubercles in two groups, separated by a transverse groove; the next molar is thicker and stouter than the preceding one, and the last is smaller, and both much resemble those of the bears, and differ notably from the pandas.
From what M. Milne-Edwards describes, we may briefly epitomise that the premolarial dentition of the Ailuropus is ailuroid or feline, and that the true molars are arctoid or ursine.
The skull is remarkable for the elongation of the cranium and the elevation of the occipital crest, for the shortness of the muzzle, for the depression of the post-frontal portion, and for the enormous development of the zygomatic arches. In another part M. Milne-Edwards remarks that there is no carnivorous animal of which the zygomatic arches are so developed as in the Ailuropus. He states that it inhabits the most inaccessible mountains of Eastern Thibet, and it never descends from its retreats to ravage the fields, as do the Black Bears; therefore it is difficult to obtain. It lives principally on roots, bamboos and other vegetables; but we may reasonably suppose from its conformation that it is carnivorous at times, when opportunity offers, as are some of the bears, and as is the Ailurus. I have dwelt at some length on this animal, though not a denizen of India proper; but it will be a prize to any of our border sportsmen who come across it on the confines of Thibet, and therefore I have deemed it worthy of space.
SIZE.—From muzzle to tail, about four feet ten inches; height about twenty-six inches.