TOTAL LENGTH 



BODY LENGTH 



AVERAGE VOL- 

 UME OF P.YRA- 

 THYROID 

 GLANDS 



1/ 



y OF AVERAGE 



VOLUME OF 



PARATHYROID 



GLANDS 



AVERAGE NUM- 

 BER OF NUCLEI 

 IN PARATHY- 

 ROID GLANDS 



Metamorphosed controls 



Young Bufo — long after metamorphosis 



1 In No. 26 the parathyroid glands were heart-shaped, hence their actual vol- 

 ume would not be so great as indicated. 



210 



