100 



LIFE ON THE EARTH. 



curious, for the earliest group, Goniatites, ceases with 

 the upper Palaeozoic Strata; Ceratites occurs* in 

 Muschelkalk, but does not enter the Lias ; Ammonites 

 begins at some height in the Lias, and dies out 

 before reaching the upper Chalk, being accompanied 

 in decline by Hamites, Scaphites, Turrilites and 

 Baculites. These distributions appear in the follow- 

 ing Table. 



Ammonites sublsevis, 



t 



Ceratites nodosus. 



f 



Goniatites striatus. 



