236& THE DAWN OF LIFE. 



(a) Perforata having calcareous skeletons penetrated with 



pores. 



(b) Imperforata having calcareous, membranous, or arena- 



ceous skeletons, without pores. 



The place of Eozoon will be in the higher sub-order, 

 Perforata. 



IV. The sub-order Perforata includes three families the 

 Nummulinidce, Globigerinidce, and Lagemdoe. Of these Car- 

 penter regards the Nummulinidee as the highest in rank. 



The place of Eozoon will be in the family Nummulinidce, or 

 between this and the next family. This oldest known Proto- 

 zoon would thus belong to the highest family in the highest 

 sub-order of the lowest class of animals. 



