VARIATION AND MUTATION 



139 



Neck 



Body 



Lacerta oceltata 



hind Legs 



Neck 



, , .Body 



Lacerta viridis 



M Hind Legs 



.Tail 

 .Body 



Lacerta agilis ^ _ H indLegs 



Tail 



Neck 



Body 



Lacerta muralls ^^^ Hind Legs 



*mmmmmm*TaH 

 I Neck 



Lacerta velox ** Hind Legs 



M Tail 



M Neck 



Lacerta deserti M Hind Leg, 



FIG. 82. Diagram showing variations in dimensions of lizards. (After Wallace.) 



influences, naturally tend to present analogous variations, or these 

 same species may occasionally revert to some of the characters of their 

 ancient progenitors. Although new and important modifications may 

 not arise from reversion and analogous variation, such modifications 

 will add to the beautiful and harmonious diversity of nature. 



