18 GENERAL BIOLOGY. 



extending from the gizzard to the anus. 

 It is expanded into lateral pouches or 

 diverticula in each somite. 

 (g) The chloragogue cells : the yellowish-brown 

 pigmented layer covering the outside 

 of the stomach-intestine. 



Make a diagrammatic sketch (X 4) of the parts 

 included under C. II. 1 to 5 (g). 

 (h) Open the crop, the gizzard, and the stomach- 



intestine by a lateral cut. 



Examine the character of the wall of each, 

 and note in the stomach-intestine the thick 

 longitudinal ridge, the typhlosole, which 

 projects into the intestinal cavity from its 

 dorsal side. 

 Make a diagram of the stomach-intestine as it would 



appear in transverse section. 

 6. The reproductive organs. 



[To see the reproductive organs, cut until fine scis- 

 sors through the alimentary canal close behind 

 the gizzard, and holding the cut end of the 

 gizzard with fine forceps, raise it carefully and 

 cut through the attachment of the dissepiments 

 (disturbing them as little as possible); cut the 

 alimentary canal across behind the 6th somite 

 and remove the entire oesophagus.] 

 In taking out the oesophagus look in the llth 

 and 12th somites for three pairs of calcifer- 



