METAMORPHOSIS OF NJEOTENOUS AMPHIBIANS 



413 



inducing marked metamorphic changes when transplanted into 

 immature animals, the}^ w(ni]d probably produce similar effects 

 in neotenous larvae while undergping resorption in the foreign 



Fig. 2 Neotenous R. clamata tadpoles. Numbers of this type of larvae, 

 measuring 75 to 90 mm. total length, with hind limbs 5 to 25 mm. long, pass an 

 extra year beyond their usual period of metamorphosis in this stage. Drawing 

 natural size. 



environment because inhibiting factors could not prevent the 

 release of the contained secretion. The experiment is briefly 

 presented in the following tables : 



