384 THE INDUCTIONS OF BIOLOGY. 



and sub-sub-groups on the same principle, there would result 

 an arrangement perhaps not much unlike that shown on 

 the page succeeding this. 



VERTEBRATA 



(Abranchiata,) 

 Mammalia 



Aves 



Reptilia 



(Branchiata) 



Amphibia 



Pisces. 



MOLLUSCA ANNULOSA 



Cephalopoda Heteropoda \ Articuldta. 



Gasteropoda- > Insecta Arachuida 



direcia ) Myriapoda Crustacea 

 \ Pulmonata Gasteropoda- 

 \ Pteropoda monoecia Annuloida. 



Lamellibranchiata Annellata Scoleidse 



Echinodermata Trematoda 

 Rotifera Tceniadse 



Turbellaria 

 Nematoidea 

 C(ELENTERATA 



Hydrozoa Actinozoa. 



PROTOZOA 



Infusoria Spongiada? Gregarinidse 



Noctiliicidce Foraminifera Thallassicollida 



In the woodcut, the dots represent orders, the names of 

 which it is impracticable to insert. If it be supposed that 

 when magnified, each of these dots resolves itself into a 

 cluster of clusters, representing genera and species, an ap- 

 proximate idea will be formed of the relations among the 

 successively-subordinate groups constituting the animal king- 

 dom. Besides the subordination of groups and their general 

 distribution, some other facts are indicated. By the distances 

 of the great divisions from the general centre, are rudely 



