

Pul. 



Ph. I : 



Pul. -i^ — 



,-H--^, H- 



Pul. 



JV 



\ 



,IV., 



Fig. 3 Section (20yu median to section 2j through the lower part of the fifth 

 arch, showing the common orifice of the glandule thyroidienne and the pre- 

 pulmonic caecum. 



Fig. 4 Section (40yu median to section 3) through tlie ventral lumen of the fifth 

 arch. 



Fig. 5 Section 20;u lateral to the point of diversion of the third and fourth 

 arches, showing the fifth arch about 5 from its most median indication. 



507 



