52 SPECIFIC FOB-MS. 



8. This diminution of the apparitions of generic types is in 

 disaccordance with the increase of the number of species 

 during the Silurian period. 



In effect, if the new types were formed by the divergence 

 of the species, as supposed by the development theory, the 

 increase of the number of specific forms must entail an in- 

 crease of the number of generic types. In any case it could 

 not cause a diminution of them. 



Then, each of the principal facts that we have given on the 

 subject of generic types, constitutes a grave discordance 

 between the theories of evolution and the reality. 



II. Specific Forms. 



1. We have never acquired the certainty and we have never been 

 induced to suppose that any species among the cephalopods 

 of Bohemia was derived by filiation and transformation from 

 another anterior species. The filiation and transformation 

 are then, in our point of view simply theoretic fictions. 



2. No species, to our knowledge, has been transformed to a new 

 generic type, neither by successive slow variations nor by 

 sudden changes. 



On the contrary we have ascertained at various times that 

 all the species and all the groups of congeneric forms, which 

 have varied sensibly from their generic type in certain par- 

 ticulars and which appeared to tend towards a new type, 

 appeared and disappeared suddenly, without leaving any 

 posterity preserving the traces of the same character. 



3. Our second phase of Fauna No. .'} possesses alone 777 species 

 of cephalopods, that is to say about 31 per cent, of all the species 

 of this order known in the Silurian. Our basin, very remark- 

 able for its small size furnishes about 45 per cent, of these. 



These accumulations of cephalopods in surfaces so restricted 

 are in contradiction with the theories ol'natural selection and 

 of the struggle for existence. 



