Hepd 



•v..- 



: ! : V •>■ ■:'.. -. 



R^rch. 



M.hep p. 



Fig. 4 Graphic reconstruction of a portion of the fore and mid gut of an embryo 

 5 mm. long (K.U.E.C. 449). X 50. The dotted lines indicate the borders of the 

 hepatic thickening. Lines A and B indicate the planes of sections represented in 

 figures 5 and 6. F.g., fore gut; Hep.d., hepatic diverticula. 



Fig. 5 Transverse section of the same embryo 0.03 mm. in front of the anterior 

 wall of the yolk stalk. X 100. 



Fig. 6 Transverse section of the same embryo 0.06 mm. posterior to the anterior 

 wall of the yolk stalk. X 100. Hep.d., hepatic diverticula, M.hep.p., anterio- 

 median hepatic pouch, formed by the fusion of the lateral hepatic diverticula. 

 P-arch.g., para-archenteric grooves. 



343 



