COR ELLA. 



On account of the transparency of the outer wall, 

 these folds of the lining membrane are distinctly dis- 

 played externally, and give quite an ornamental 

 appearance to the organ. The mucous membrane of 

 the oesophagus is also longitudinally folded ; that of 

 the intestine is not so. 



The hepatic organ (figs. 81 and 32), like the rest 

 of the digestive system, is also remarkably modified. 

 The ultimate structure of the liver is composed of a 

 minute network of anastomosing tubes spread over the 



FIG. 32. Biliary ducts in Corella parallelogramma. x alxmt 60. (Eeduced 

 one-half from drawing made with ^ inch object-glass.) 



outer surface of the intestine, the interstitial meshes 

 being filled up with still more minute anastomosing 

 and branched tubes forming as many systems, the 

 ultimate (terminal) twigs of which end in blind sacs, 

 occasionally a little enlarged and rounded, and some- 

 times bifid. The main branches leading from the net- 

 work exhibit a tendency to divide dichotomously, and 

 unite to form two slender ducts which pass at once 

 from the intestine to the left side and close to the 

 posterior margin of the stomach, into which they 



