86 ON CLASSIFICATION. 



group, and of the more highly organized classes of the lower 

 divisions, with which he was so well acquainted, remain as he 

 left them ; while the lower groups, of which he knew least, and 

 which he threw into one great heterogenous assemblage, — the 

 Radiata, — have been altogether remodelled and rearranged. 

 Milne-Edwards demonstrated the necessity of removing the 

 Polyzoa from the radiate mob, and associating them with the 

 lower Mollusks. Frey and Leuckart demonstrated the sub- 

 regnal distinctness of the Coelenterata. Yon Siebold and his 

 school separated the Protozoa, and others have completed the 

 work of disintegration by erecting the Scolecida into a primary 

 division, of Vermes, and making the Echinodermata into an- 

 other. Whatever form the classification of the Animal King- 

 dom may eventually take, the Cm r ierian Radiata is, in my 

 judgment, effectually abolished : but the term is still so fre- 

 quently used, that I have marked out those classes of which it 

 consisted in the diagram of the Animal Kingdom (p. 6), so 

 that you may not be at a loss to understand the sense in which 

 it is employed. 



