320 



APPENDIX 



and synthetic character of such f(.rins as Cryptozoon, 

 RcceptacuHtcs, and Arch;uocyathus, and their asscjci- 

 ation with j^enerah'zed types of Crustaceans and 

 lirachiopuds, we can scarcely fail to perceive that 

 at the base of the Pabiiozoic we are ieavini; the 

 reign of the higher marine invertebrates, and enter- 

 ing on a domain where lower and probably Proto- 

 zoan forms must be dominant, and so are getting at 

 least within calculable distance of the beginnings of 

 life. 



F. Pre-Geological Evolution. 



Reference is incidentally made in the text to the 

 doctrine implied in the old notion of successive 

 cataclysms and renewals of the earth, held by 

 some ancient mythologies and philosophies, and 

 revived in a slightly different form by Mr. Herbert 

 Spencer, in connection with the requirements of the 

 Darwinian evolution by natural selection. This 

 primitive idea was illustrated at considerable length 

 by Professor Poulton in his address as President of 

 the Zoological Section of the British Association at 

 its meeting in Liverpool (September, 1896). In this 

 new and ably presented form, it deserves some notice 



