THE PRE-ADAMITE EARTH. 



The Mollusca have neither internal skeleton nor articulated 

 envelope. Their bodies are sometimes naked, but often protected 

 by a shell. 



The Radiata, including the lowest forms of organic life, is a 

 group consisting of classes so heterogeneous, that many naturalists, 

 not following Cuvier, have differently resolved them. They have 

 in general no articu^ted skeleton, either internal or external, and 

 scarcely exhibit the rudiments of a nervous system. Those to 

 which the name Radiata is more properly applied are composed 

 of organs disposed radially around a centre or axis. 



Some naturalists have given to this division the name of 

 ZOOPHYTES, from a Greek word, signifying the link between 

 animals and vegetables ; while others have confined this latter 

 term to the Polyparia. 



32 



