Again, those deposits which are situated at the greatest distance inland have often furnished objects which can only have been obtained upon the sea-shore. At Cro-Magnon more than three hundred shells of _Littorina littorea_, an oceanic species, have been found. On the other hand the _Cypræa rufa_ and _C. lurida_ found upon the Laugerie-Basse skeleton, which I have mentioned above, are unquestionably Mediterranean. Sometimes the molluscs peculiar to the two regions have been found in the same place. In the Gourdan grotto, in the middle of the central Pyrenees, M. Piette found five oceanic species, one Mediterranean, and five common to both seas. The fossil shells of the Périgord deposits were generally brought from the _falun_ of Touraine, those of Gourdan must have been collected, partly in the Landes and in the neighbourhood of Dax, and partly near Perpignan. In this same grotto M. Piette discovered a pumice-stone, which had been used in polishing needles, and which he considered had come from the volcanic region of Agde. From these, and some other analogous facts, M. Piette and M. de Mortillet have thought there is sufficient reason to suppose that the tribes of the Vézère had no fixed habitation, but led a nomad life, visiting in turn the shores of the two seas, hunting in the mountains during the summer the game of the season, and passing the winter in a warmer climate. We cannot adopt this hypothesis. The ever-increasing fauna among the cooking _débris_ denotes a population, which, as it multiplied in every way, made more and more use of the resources of the country. These same heaps furnished Lartet with reindeer bones of every age, amongst which were those of young fawns. Our great authority concludes from this fact that the tribe was stationary during the entire year, and we believe him to be right. The man of Cro-Magnon, La Madeleine and Gourdan, must undoubtedly have always been within reach of the reindeer, from which they obtained nourishment, arms and clothing. But the migrations of this animal, under the influence of a but slightly varying maritime climate, could not have been very extensive, and the troglodytes of Périgord or the Pyrenees, if they wished to keep within its range, would not have had such expeditions to undertake, as those of the Red-Skins in pursuit of the bison. This semi-stationary life did not exclude travels by land or even by sea. Among the fossil shells found at Laugerie-Basse, there are some which could only have come from the Isle of Wight. Now, in the age of the reindeer, there was no longer land communication between France and England. As M. Fischer has remarked, the presence of these shells in a continental station proves the existence of navigation.