210 THE THEOBY OF EVOLUTION 



stage with well-formed gills and a rudder tail, which 

 naturally are never of service. 



What follows from these examples, and what has been 

 inferred ? Other newts, like the Tritons, lay their eggs 

 in water, from which then in the first place there issues 

 a larva developed with swimming tail and gills and later 

 the form adapted for land life of the lizard with lungs 

 and round tail. The two Salamanders above mentioned 



4^\ N 

 / 





FlG. 45; TURBOT; 



produce first the larvse, the one kind earlier, the other 

 later. 



This therefore implies that to the type of the tailed 

 newt, specially to the sub -order of the Salamandrinee, 

 a larval form belongs, which lives in the water and 

 is conformably equipped, but that the development, 

 which with all is the same and remains the same, may 

 be more or less intra-uterine. Why that happens we 

 need not really know ; for the Alpine Salamander, 

 which lives in damp woods of high elevation, the neces- 



