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 



[AbrancMata) 



Mammalia 



Aves 



Beptilia 



[Branchiata) 



Amphibia 



Pisces 



MOLLUSCA 



Cephalopoda Heteropoda 

 Gasteropoda- 

 dioecia 

 ( Pulmonata Gasteropoda- 

 \ Pteropoda moncecia 



Lamellibranchiata 



Annulosa 



Articulata 

 Insecta Arachnida 



Myriapoda Crustacea 



Annuloida 

 Amiellata Scoleidre 



Echinodermata Trematoda 

 Eotifera Toeniadoe 



Turbellaria 

 Nematoidea 



CcELENTERATA 



Hydrozoa 



Actinozoa. 



Infusoria 



Noctilucidce 



Protozoa 



Spongiadse 

 Foraniinifera 



Gregarinidae 



Thallassicollidce 



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- 



