PLATE IV. The effect of genetic factors in hybrids of Triton taeniatus and 

 T. cristatus. (a-d) four larvae of about the same age. (a) Triton taeniatus; 

 (b) T. cristatus; (c) T. cristatus i X T. taeniatus cT . (d) T. taeniatus V X 

 T. cristatus cj". Note the white pigment cells in the caudal fin. (e-g) the 

 shape of the limbs in larvae of the same age. (e) Triton taeniatus; (f) T. 

 taeniatus f^ X T. cristatus (f. (g) T. cristatus. After Hamburger. 



