302 



THE INDUCTIONS OF BIOLOGY. 



tlons 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 : — 



Vertebeata 



{Abra7ichiata) 



Mammalia 



Aves 



Reptilia 



{Jlranchiaia) 



Amphibia 



Pisces 



MOLLUSCA 



Cephalopoda Heteropoda 

 Gasteropoda- 

 dioicia 

 ( Pulmonata Gasteropodit- 

 \ Pteropoda moncecia 



Lamellibranchiata 



Annulosa 



Articulata 

 Insecta Arachnids 



Myriapoda Crustacea 



Annuloida 

 Annellata Scoleidje 



Echinodermata Trematoda 

 Eotifera Tceniadse . 



Turbellaria 

 Nematoideu 



CCELEKTEEATA 

 Hydrozoa Actinozoa. 



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- 



