XXVI 



Introduction. 



Tabular View of the System of Classification adopted in this 

 work, shewing the various Sub-kingdoms in some of the 

 relations of mutual affinity and of rank which they have 

 been supposed to hold to each other. In the cases of several 

 names an oblique position would have been truer to nature 

 than the horizontal one which they occupy in the Table. The 

 lines abut upon the names of the Classes or Orders by which 

 the several Sub-kingdoms have been regarded as connected 

 with each other. (Arrangement of Sub -kingdoms after 

 Gegenbaur.) 



VEBTEBBATA 



(Pharyngobranchii) 



MOLLTTSCA 



(Polyzoa) (Tunicata) 



ARTHBOPODA 



(Crustacea) 



ECHIKTODEBMATA 



(Crinoidea) (Holothurioidea) 



VEBMES 

 (Annulata. Tubicolae) (Gephyrea) (Platyelmintbes) (Rotifera) 



COELENTEBATA 



PBOTOZOA 



(Spongiadae) (Infusoria) 



