VARIATION AND MUTATION 139 



J^ectt 

 ..Body 



Lacerta ocellata 



-JfindLegs 



Neck 



Lacerta viridis 



N Hind Legs 



.Tail 



M Neck 



I N Body 



Lacerta agilis M Hind Legs 



Tail 



Neck 



** JBody 



Lacerta muralis ^^^ Hind Legs 



Neck 



Lacerta velox ^^ Hind Legs 



Tail 



m- Neck 



o</y 



Lacerta deserti M Hind Legs 



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. 



