



INTRODUCTION. 



suggesting the term Gastro-duct, by which epithet this 

 muscular channel will be designated in the following 

 pages.] 



View of Gastro-duct, after Flourens. 



u. A portion of the oesophagus cut opeu, showing the internal folds ot the mucous 



membrane. 



*. The opening of the oesophagus into the paunch, 

 r, c. The gastro-duct. 

 d, <l. Muscular fibres passing completely round the edge of the gastro-duct, and 



forming a sort of sphincter. 

 c. The opening from the gastro-duct into the third cavity. 



