S. YOSCHIDA 207 
to be looked upon physiologically as the food-store, similar to the rumen in 
Ruminants. 
From the statements above given it is true that the cardiac sac can not 
be distinguished from the Oesophagus by means of a rough macroscopical 
survey such as just done, so that the two parts are to be regarded as one and 
the same structure. In other words, the cardiac sac is nothing other than 
the distal part of the Oesophagus strongly bulging out. 
The Fundus, the broadest part of the stomach, is marked off against the 
cardiac sac just stated by a continuous ridge describing a circle which is 
situated in an oblique position. On the bottom surface of the stomach the 
boundary ridge is found just opposite the oesophageal opening, and on the 
roof surface, where the circle is notched, it is seen right to, and at a little dis- 
tance from the oesophageal opening, whiles on the lateral walls it is shifted to 
the left side beyond the oesophageal opening. The Oesophagus is, therefore, 
not led directly to the Fundus, but passes into the cardiac sac through a 
narrow groove which deserves the name of Oesophagus-cardiac groove. The 
boundary ridge itself shows numerous large and small undulations which 
occur especially in the adjacent parts of the oesophageal opening. The sur- 
face of the F'undus walls is apparently smooth ; in fixed specimens some 
irregular foldings appear, owing doubtless to a strong contraction of the 
muscle-coat of the siomach. 
Without any demarcation, the fundus passes over into the Pylorus where 
the gastric sac is considerably narrowed into the pyloric constriction. The 
surface of the pylorus walls is likewise smooth. The Duodenum which is 
represented by a slender tube forming the distal continuation of the Pylorus 
shows a sudden change on the inner surface, presenting velvety appearance, 
which is, of course, due to occurrence of the thickly set together 
In the stomach of Lepus cunniculus (rabbit) the cardiac and pylorus por- 
tions may be distinguished on the surface of the inner side, the surface of the 
latter portion being tufted ; the wall on the former is rather thin, particularly 
when the stomach is full of food. P'ood, when taken, passes into the cardiac 
