49 



No. of 

 Species 



Brought over . . . . 256 



Common to Bordeaux, Dax, Touraine, Tnrin,Vienna, Angers & Baden 1 

 ib. ib. ib. Angers and Baden . . 2 

 ib. ib. Vienna and Baden ... 4 



263 



By adding to the above 134 species which are common to the 

 Miocene, and the two other epochs . . . . 134 



Ihe total number of analogues will be found to be . . 397 



By subtracting from the total number of species of the above 



localities 1418 



those species which are common to different localities . . 397 



We find the real number of species of this epoch to be . 1 021 



The number of living analogues is 176, which is in the proportion of 

 rather less than 18 in 100; the number of fossil analogues, after sub- 

 tracting those which pass from the Miocene into both the Pliocene and 

 Eocene epochs, is 168, which is very nearly in the same proportion. 



The species which pass from the Miocene into the Pliocene period are 

 in number 196, of which 114 are living, and 82 fossil, which is very 

 nearly in the proportion of 20 in 100 of the total number of species of 

 the latter epoch. Thus it is remarkable that there are 18 in 100 living 

 analogues, 18 in 100 of analogous fossil species, and that 20 in 100 of 

 these species pass from the Miocene to the Pliocene epoch. 



The 114 living species, and the 82 fossil ones, which are common to 

 the Miocene and Pliocene periods, are distributed, in the last-mentioned 

 epoch, in the following manner : 



LIVING. FOSSIL. 



Crag ... 4 Crag . . 4 



Italy . . . 48 Sicily . . 1 



Sicily ... 5 Italy . .71 



Sicily and Italy . 46 Sicily and Italy . 5 



Sicily, Italy, and the Crag 1 1 Sicily and the Crag 1 



114 82 



The preceding distribution of species will show that Italy is repre- 

 sented in the Miocene period by 181 species, Sicily by 69, and the Crag 

 by 20. 



EOCENE PERIOD. 



Paris, London, Valognes, Belgium, Castelgomberfo, and Pauliac. 



A small number of species only have been examined from Belgium, 

 Pauliac, and Castelgomberto, but which agreed, with few exceptions, 

 with species of the Paris basin. So also in regard to Valognes. 



VOL. in. d 



