Figure 6G is a section through the plane 750 of figure 6A. The oesophagus, _oe_, is seen as a small, circular opening between two much larger openings, the lungs, _lu_. The epithelium of the oesophagus is the same here as in the more anterior regions described above; that of the lung rudiments is very variable in thickness, even in different parts of the same section, being in some places composed of a single layer of cuboidal or even flattened cells, in other places consisting of four or five layers of cells (not well shown in the figure). Surrounding the epithelium of the lung rudiments is a thin layer of quite dense mesoblastic tissue. A fairly well defined mesentery, _ms_, is now present in this region. Filling the greater part of the body cavity, below the oesophagus and lung rudiments, is the liver, _li_; and ventrad to the liver the section passes through a loop of the duodenum, _d_. The epithelium of the duodenum consists of four or five layers of compactly arranged cells, near the center of an oval mass of fairly dense mesoblast. In a lateral projection of this mass of mesoblast lies a small, circular opening, the bile duct, _bd_. Its epithelium consists of a single layer of columnar cells. In more anterior sections the bile duct is larger in cross section, being about one-half the diameter of the oesophagus. As has been said it ends blindly at a point a short distance anterior to the antero-ventral edge of the liver. A few sections caudad to the one under discussion the bile duct connects with the liver, figure 6A, _bd'_; and some distance caudad to this the duct opens, _bd''_, into the duodenum so close to the opening, _pan'_, of the pancreas that it is difficult to determine whether the latter organ has a separate opening into the duodenum or opens into the bile duct. At some distance ventrad to the structures just described the intestine is cut, by the plane of the section, in two places, _i_. The more dorsal of these is inclosed and has, under this magnification, the same appearance as the duodenum, _d_; a higher magnification, however, shows that its epithelium consists of a single layer of tall, rather clear, columnar cells. The more ventral of the two sections, above mentioned, which is continuous with the dorsal section a very short distance caudad to this point, is in the region that opens to the yolk--in fact a number of yolk-granules, _y_, may be seen in the opening. The epithelium of this part of the intestine consists of a single layer of clear, columnar cells, which, around the borders of the opening, are thrown into numerous folds and are almost of goblet form.