The Life Processes of the Individual 145 



Epth 



FIG. 77. Histological details of alimentary canal of worker: A, cross- 

 section of ventriculus ; B, section of ventriculus wall ; C, section of 

 Malpighian tubule ; D, cross-section of small intestine ; E, section of 

 ventriculus wall, showing formation of enzyme cells ; F, section of 

 anterior end of rectum* showing rectal glands (RGl) ; G, slightly 

 oblique section of posterior end of ventriculus, showing openings of 

 Malpighian tubules. 



larval food is regurgitated can no longer be considered as 

 at all tenable. 



Behind the ventriculus, the alimentary canal narrows 

 to form the small intestine (Fig. 60, SInt) and at the point 



