8 THE BIOLOGY OF STENTOR 



pouch which is often called the buccal cavity. The membranellar 

 band runs along the outer edge of this pouch and then coils 

 sharply inward into an invaginated tube which itself coils about 

 one turn into the cell. This tube we shall call by the rather non- 

 commital term of gullet. Food vacuoles are separated off the inner 



IroniaL Held. 



membrsLncUar band 

 clear harder stripe 

 oraiLpomJi 



contractile vaciwle 

 cv pore 



ruJlei 



{ood vacude 



macromiclesLr node. 



micronus^us 



hxMIast 



Fig. I. Descriptive diagram of Stentor coeruleus. 



end of the gullet, which therefore has a temporary film-like 

 closure to prevent endoplasm from escaping into the gullet but 

 capable of acting so as to allow passage of food into the cell. 

 Probably the ectoplasmic lining of the gullet simply ends here in a 

 thin membrane which can stretch and increase to form the wall 



