HYPOPHYSIS OF PETROMYZON AND AMIA 



269 



Text-fig. 12. 



1 mm. 



~~~ DW 



Petromyzon fluviatilis. Ammocoete. Transverse 

 section slightly farther back and anterior to the gland showing 

 the hypophysial cavity in the middle of the hypophysis. 



Text-fig. 13. 



—Fb 



■PA 



-HC 



^--DW 



ymm. 



Petromyzon fluviatilis. Ammocoete. Transverse 

 section still farther back showing the relation of the gland 

 to the hypophysial cavity. 



