436 EMBRYOLOGY OF THE LOWER VERTEBRATES CH. 



In the Urodela the least specialized subdivision of the Amphibia 

 the evolution of external form closely resembles that of the Lung- 



Oi 



>< . :..juni-ii1 n! ' ' running fulfil' ri. ( l-Y"iii Sciiion In (In- .\\ttiti-nliiin 

 A, hU^S'J - : l>. -II ; I i.MaKiiiiir.-iii'Hi :il'""H i>\ 'liam.-;. 



An i-arly Stage oi' Mich ;i ivlalivdy jiriinitivi- mcinbcr ;is 

 lit iv;i<lilv In- nnslakcii 1'nr iln- (-(.rrcspdiKliii-- st.-i^v !' 



