G. K. DE BEER 



a distinct element of the pituitary bod}', notably, by Tilney 

 (1913), Woerdeman (1914), Baumgartner (1916), and Atwell 



Text-fig. 24. 



PI 



Petromyzon fluviatilis. Aiumocoete. Horizontal sectioa 

 showing the lappuig of the lateral lobes round the pars intermedia. 



Text-fig. 25. 



Posterior 



PI 



Petromyzon fluviatilis. Reconstruction of the pituitary 

 body of an ammocoete seen from the ventral surface after 

 removal of the ventral wall of the hypophysial cavity. 



(1919). Woerdeman considers the possibility that its homologue 

 is to be found in the accessory organ (Text-figs. 8 and 9) 



