HALL : MESONEPHUOS AND MULLERIAX DUCT IX AMPHIBIA. Ill 



O 



Figures 0-T. 



Six diagrammatic figures representing the relation of the Miillerian evaginations to the 

 nephrustomes, the Miillerian duct to the Wolffian, etc. The Miillerian evaginations 

 are somewhat below the nephrostomes in each case and the Miillerian duct is below 

 the Wolffian. 



Figures and P represent two stages in elasmobranchs; Figure Q, a hypothetical, primitive 

 condition in Amphibia; Figure R shows the condition in Amblystoma; Figure S, that 

 in Hyla; and Figure T, that in Rana. 



