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. 



YERTEBRATA 



(^Abranchiata) 

 Mammalia 



Aves 



Reptilia 



(Branchiata) 



Amphibia 



Pisces. 



MOLLUSCA 

 Cephalopoda Heteropoda 

 Gasteropoda- 

 dioecia 

 \ Pulmonata Gasteropoda- 



( Pteropoda monoecia 



Lamellibranchiata 



ANNULOSA 



Articulata. 

 Insecta Arachnida 



Myriapoda Crustacea 



Annuloida. 



Annellata Scoleidse 



Echinodermata 



Rotifera 



CCELENTERATA 

 Hydrozoa Actinozoa. 



Trematoda 

 Toeniadae 

 Turbellaria 

 Nematoidea 



Infusoria 

 NoctiliLcidm 



PROTOZOA 



Spongiadae 

 Foraminifera 



Gregarinidse 

 ThallassicolliddR 



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 



