Skulls of this type have been so frequently described,[17] individually and collectively, that it is unnecessary to give another detailed account. It will be sufficient to say that they are large and massive, the vault is low, and they are specially distinguished by having over the eye sockets a heavy and continuous projecting ridge, known as a _torus_, which is one of the distinguishing features of the large anthropoid apes. Another point of importance is that the head was so attached to the body that it could not have been held absolutely erect, and must have produced a slouching gait, though the degree of this slope varied considerably in different specimens, and in the case of the Rhodesian skull was quite halfway between the slope of the Gibraltar skull and that of the gorilla.[18] But it is unnecessary for our purpose to pursue this question further, for with the arrival of modern man, after the last glaciation was past, Neanderthal man disappeared. That the two races met, though not necessarily in this continent, seems clear from the fact that at Audi, near Les Eyzies, in the Dordogne, we find a culture, which in some respects resembles that of Le Moustier, and in others the succeeding culture of Aurignac.[19] That these two races interbred is unlikely, for Neanderthal man must have appeared an unsightly beast to his modern successor. In any case, if mating did take place, the union must have been sterile, for, in spite of much that has been written to the contrary,[20], there is no clear evidence of the survival of any distinctive Neanderthal traits in the men of later days.[21]