FOSSIL ANIMALS. 



73. The Ceratites belong to the family of the mollusca 

 called Bacculine, the only known species of them found in the 

 lowest strata of the cretaceous system. 



Fig 20. 



Fig. 22. 





Fig. 23. 



Reticulipora obliqua. 



74. Among the most wonderful results of the animalisation of 

 the earth, in the remote geological periods, is the enormous extent 

 of matter which various species of animals elaborated from the 

 gaseous or liquid element around them, by vital action, and 

 which have remained as a perpetual record of their presence. 

 Whole islands, and even continents, have been produced by the 

 secretive functions and other vital agencies of countless myriads 



F 2 67 



