SPKCIKIC I- o ISMS. 



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

 disaccordn nco with the increase of the number of species 

 during the Silurian period. 



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

 of the species, its 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 Form*. 



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 liliation and transformation from 

 another anterior species. The filiation and transformation 

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



1. 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 pnr- 

 ticnlars 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 specie- 

 Of Cephalopods, thai is to say about .'51 per cent, of all the species 

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

 able lor its small sixe furnishes about 4."> per cent, of these. 



These accumulations of cepludopods in surface- so restricted 

 are in conl radict ion with the theories of natural selection and 

 of the st ruu'irle for existence. 



