346 Count Gaston de Saporta on the Temperature 



Ulmus bicornis, Ung. Radoboj. 

 Populus palisomelas, Sap. Armissan. 



salerophylla, Sap. Armissan. 



heliadum, Ung. Radoboj. 



Salix linearis. Sap. Armissan. 

 Acer narbonense, Sap. Armissan. 



pseudo-campestre, Ung. Armissan. 



megalopteryx, Ung. Radoboj. 



campylopteryx, Ung. Radoboj. 



Juglans radobojana, Ung. Radoboj. 



< basilica, Ung. Radoboj. 



Cercis radobojana, Ung. Radoboj. 



Thus at the level of Armissan and Radoboj the group of 

 European genera no longer appears so complete as in the more 

 recent stages ; nevertheless the principal genera are still at least 

 as richly represented as in the present epoch, and the species, 

 generally founded on prominent organs, leave no room for any 

 uncertainty as to their determination. 



The change becomes more sensible on advancing towards the 

 Tongrian properly so called, represented by the floras of Saint- 

 Jean-de-Garguier near Marseilles, of Saint-Zacharie (Var), and 

 of Haering and Sotzka in Austria. The following is this new 

 list :— 



Alnus prisca. Sap. St.-Zacharie. 

 Betula ulmacea. Sap. St.-Zacharie. 



pulchella, Sap. Marseilles. 



Ostrya tenerrima. Sap. St.-Zacharie. 

 Carpinus cuspidata, Sap. St.-Zacharie. 

 Quercus lonchitis, Ung. Sotzka. 



' elana, Ung. St.-Zacharie. 



Castanea atavia, Ung. Sotzka. 

 Ulmus primceva. Sap. St.-Zacharie. 

 Populus leuce, Ung. Sotzka. 

 Acer primavum, ^a.p. St.-Zacharie. 

 Juglans eltenioides, Ung. Sotzka. 

 Cratcegus paltsacantha, Sap. St.-Zacharie. 



The genera which no longer recur beneath this horizon are 

 CoryluSf Foffus, and Celtis. The absence of the others remains 

 doubtful, more especially as we find indications of them at a far 

 more distant period. Moreover it would be wrong to conclude, 

 from the absence of a genus, its absolute non-existence; we may 

 assume that in many cases its subordinate position placed an 

 insurmountable obstacle to its passage to the fossil state. What 

 is certain is the existence of the genera which figure in our list 

 at a period when the vegetation was still endowed with a well- 

 marked tropical and Australian character. Several of these 

 genera, especially Alnus, Betula, Carpinus, Ostrya, Acer, and 

 Crataegus, are represented by forms the analogy of which with 



