368 



RICHARD E. SCAMMON 



part at any rate, are connected with the latter by short ducts. 

 A reconstruction of the bihary apparatus of this stage is shown in 

 figures 47, 48 and 49. 



b.hep.p. 



J? AuctmzA. 



D.cysK 



_G.bl- 



Fig. 20 Transverse section of an Acantliias embryo 19 mm. long (S.C. 2). X 

 100. D.cyst., cystic duct; G.bl., gall bladder; L.hep.p., lateral hepatic pouch; 

 P.diicl.med., pars ductus mediana. 



The pars ductus mediana, or as the structure may now be 

 termed, the terminal part of the ductus choledochus, is tubular in 

 form. The pars hepatica mediana is reduced in size antero- 

 posteriorly and expanded laterally. The vertical cleft dividing 

 it into right and left parts lies lateral to the left wall of pars due- 



