310 THE DEVELOPMENT OF THE CHICK 
left, as in mammals; in the chick the lateral bending of the 
stomach appears to be uncomplicated by any such rotation. The 
curvature leaves a large space within it to the right containing 
the meatus venosus and liver, in short, the entire median mass 
of the septum transversum. 
The main divisions of the intestine are marked out by their 
position, size-relations and structure before the closure of the 
yolk-stalk; thus on the third day the cesophagus appears as a 
constricted portion immediately behind the pharynx, and the 
stomach as a spindle-shaped enlargement behind the cesophagus; 
the duodenum is indicated at the same time by the hepatic and 
Fic. 179. — Viscera of a chick embryo of 6 
days, seen from the right side. (After 
Duval.) 
All., Allantois. Au. r., Right auricle. 
B.a., Bulbus arteriosus. ¢. pr., Ceeeal pro- 
cesses. D. L., Loop of the duodenum. Giz., 
Gizzard. Lg. r:, Right lung. Li., Liver. 
R., Reetum. t. R., Tubal ridge. V., Ven- 
tricle. W.B., Wolffian body. Y.St., Yolk 
stalk. X., Duodeno-jejunal flexure. 
pancreatic outgrowths. The form of the intestine on the sixth 
day is illustrated in Figure 179. Behind the stomach, the intes- 
tine forms two loops descending ventrally. The first or duodenal 
loop is relatively slightly developed at this time, and forms an 
open curve Just beneath the right lobe of the liver. Its ascend- 
ing limb rises to a high dorsal position just behind the liver, and 
