THE ALIMENTARY CANAL AND ITS GLANDS. 



103 



lips of the cuj)s, which are quiescent in B. Comparing this with 

 what is known to take place in other insects during digestion, there 

 is every reason for believing that the proliferated cellules are filled 

 with the digestive secretion, and that E represents a stage immedi- 



LMcl 



p Ymci 



Fig. 46. — Histological details of alimentary canal of worker : A, cross section of ventriculus 

 showing peritrophic membranes (Piiih) ; B, section of wall of ventriculus showing 

 epithelial cups with cells in resting condition and covered by gelatinous mass (pp) ; 

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

 ventricular epithelium after formation of numerous small digestive or enzyme colls 

 (Enz) given off into gelatinous matrix (pp) ; F, section of anterior end of rectum 

 through rectal glands (ItOl) ; G, part of slightly oblique section through posterior end 

 of ventriculus and anterior end of small intestine, showing openings of Malpighian 

 tubules (Mai) into the latter. 



ately subsequent to one of greatest secretive activity, in which there 

 is a large number of little cells {Em) highly charged with the 

 enzyme-containing digestive juices imbedded in a gelatinous matrix 

 covering the inner surface of the epithelium. This matrix next 



