"1_st_, The great quantity of Algæ and marine Naiades, characters owing to the extent and thickness of the marine formations of this epoch. "2_d_, The great number of Coniferæ, the greater part belonging to genera still existing, but among which the Cupressineæ appear to predominate, especially if we admit as positively belonging to this family the various fruits of the Isle of Sheppey, which M. Bowerbank has described under the name of Cupressinites, and of which M. Endlicher has formed the genera Callitrites, Frenelites, and Solenostrobus. If these fruits really belong to European vegetation, they indicate very peculiar generic forms, probably now wholly extinct. "3_d_, The existence of many large species of palm, equally shewn by the occurrence of their leaves and stems. "2. _Miocene Epoch._--This Eocene or middle epoch of the Tertiary formations appears to me to comprehend the following localities among those which have furnished materials for the study of the vegetation of the Tertiary period: 1_st_, In the environs of Paris, the superior sandstones, or those of Fontainebleau and the _Meulieres_, or Buhrstone, which crown our coasts; 2_d_, The sandstone, with impressions, in the environs of Mans and Angers, and probably those of Bergerac, in the department of the Dordogne; 3_d_, A part of the Tertiary formations of Auvergne, and particularly those of the mountain Gergovia, formations which, by their impressions, appear more ancient than those of Menat, but which perhaps all belong to different stages of the Pliocene epoch; 4_th_, The fresh-water formations of Armissan, near Narbonne, the Gypsum of Aix in Provence, the Lignites of Provence, whose vegetable fossils are scarcely known; finally, the Lacustrine formations, rich in the wood of palms, and in stems of Monocotyledons, from Upper Provence, near Apt and Castellane; 5_th_, A part of the Tertiary formations of Italy, and particularly those of Superga, near Turin; 6_th_, The Mollasse of Switzerland, with its Lignites, at Lausanne, Koepfnac, and Horgen, containing the remains of palms; 7_th_, The Lignites of the banks of the Rhine near Cologne and Bonn, at Friesborf, Liblar, &c., sometimes enclosing wood of palms, and those of Wetteravia at Nidda, near Frankfort, and other places; as well as those of Weisner near Cassel, which all appear to be of the same epoch, although those of Wetteravia, by the abundance of certain genera of Dicotyledons, such as _juglans_ and _acer_, and even by many cases of specific identity, seem to make a nearer approach to the Pliocene flora; 8_th_, A part of the Lignites of Bohemia, and particularly those of Altsattel, whose fossils, described by M. de Sternberg and M. Rossmæssler, generally agree with those of the other localities already mentioned. The other Lignites of Bohemia, those of Bilin and of Comothau in particular, enter completely into the Pliocene flora; 9_th_, Hoerring in the Tyrol, and Radoboj in Croatia, of which M.