388 RICHARD E. SCAMMON 



tive of the secondary median hepatic pouch; the middle part 

 from the pars ductus lateraUs, a derivative of the posterior part 

 of the primary hepatic diverticula, and a posterior part formed 

 from the 'floor of the duodenum and valvular intestine. 



17. Finally, the results of this study may be summarized in 

 tabular form as given below, starting with the sources of the he- 

 patic apparatus on the left hand side, and ending with end results 

 of their evolution on the right. In this table the minor ducts are 

 arranged in the way that they seem to occur most frequently in 

 the late embryo or new-born fish. To this table should be added 

 the statement that all those embryonic structures which are in- 

 cluded under the term 'pars hepatica' give rise to hepatic trabe- 

 culae as well as to the conducting structures which are listed 

 here. 



