3IO Natural History Bulletin. 



9. The processus infundibuli is also of epiblastic origin. 



10. The hypophysis cerebri is the direct result of cell pro- 

 liferation, and is not a mechanical constriction. 



11. The processus infundibuli is also the direct result of 

 cell proliferation. 



12. The further development and union of the hypophysis 

 cerebri and processus infundibuli form the structure known 

 in adult Mammalia as the pituitary body; the hypophysis cere- 

 bri developing into the anterior lobe, the processus infundibuli 

 developing into the posterior lobe, both being assisted by the 

 proliferation of cells from the mesoblast. 



Histological Laboratory^ 



State University of lozva. 



March, i8gj. 



