(302 THE INDUCTIONS OF BIOLOGY. 



tions existing among the several great groups of the animal 

 kingdom, by placing these groups at the ends of four or five 

 radii, diverging from a centre. The diagram I cannot 

 obtain ; but in the published reports of his lectures at the 

 School of Mines the groups were arranged thus : 



VERTEBRATA 



(Abranclriaia) 

 Mammalia 



Aves 



Reptilia 



(Branchiata) 



Amphibia 



Pisces 



MOLLTJSCA ANNULOSA 



Cephalopoda Heteropoda \ Articulata 



Gasteropoda- Insecta Arachnida 



dioecia ) Myriapoda Crustacea 



( Pulmonata Gasteropoda- 

 \ Pteropoda monoacia Annuloida 



Lamellibranchiata Annellata Scoleidre 



Echinodermata Trematoda 

 Rotifera Treniadae 



Turbellaria 

 Nematoidea 



CCELENTERATA 

 Hydrozoa Actinozoa. 



PROTOZOA 



Infusoria Spongiadae Grearinid{e 



NoctilucidcK Foraminifera Thallassicollida 



What remnant there may seem to be of linear succession 

 in some of these sub-groups, is merely an accident of typo- 

 graphical convenience. Each of them is to be regarded 

 simply as a cluster. Were Prof. Huxley now to revise this 

 scheme, he would probably separate more completely some of 

 the great sub-groups, in conformity with the views expressed 

 in his Hunterian Lectures delivered at the College of Sur- 

 geons in 1863. And if he were further to develop the 

 arrangement, by dispersing the sub-groups and sub-sub- 

 groups on the same principle, there would result an arrange- 



