THE ANIMAL KINGDOM. 



37 



gious quantities in the secondary and tertiary beds, and 

 they abounded to such an extent in the seas which over- 

 flowed some of our continents, that their carapaces, by 

 mere aggregation, have formed imposing prominences. 



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20. 1, Eock of the Arabian Chain formed by Agglomerated Nummulites used for building 

 the Pyramids of Egypt; 2, 3, Interior View of Nummidites; 4, Nummulites of which the 

 Sphinx is exclusively composed (Lybian Chain). 



Throughout a vast extent tliese really constitute the 

 Arabian chain which extends along the Nile; there they 

 are so numerous, and heaped up in such a manner, that 

 there is scarcely any matrix to bind them together. In 

 many regions of Upper Egypt which I have traversed, the 



