176 



MALL. 



[Vol. V. 



O.E. 



The communication with the pleuro-peritoneal cavity has become 

 constricted to a narrow canal, as shown in Fig. 9. The cavity 



itself is still pointed on its 

 oral side, extending up to the 

 luns:. On the aboral side it 

 extends beyond the greater 

 curvature of the stomach, 

 forming the omental cavity. 

 The liver at this stage is 

 composed of two lobes, the 

 right slightly larger than the 

 left, and connected with each 

 other by a complete band of 

 liver tissue. A lobus Spi- 

 gelii, as exists in birds, has 



Fig. 9. Corrosion preparation of the gastric not yet formed, 



diverticulum (lesser peritoneal cavity) of a dog p^ s £ a g e later (Fi' T . 10), 



10 millimetres long. Enlarged 44 diameters. stomach has twisted 

 The view is from the left side, and the stomach 



is outlined. <E., oesophagus; G. £., gall blad- about, holding in great part 



der; /'..pancreas; D., duodenum; D., second its adult position. The liver, 

 canal to the liver; P. P., pleuro-peritoneal w hj c h before lay On the 

 cavity; F. W., foramen of Winslow; 0., , . , r , , 



3 , ventral side of the stomach, 



omental cavity. 



now lies on the aboral, and 

 in great part on the dorsal side. The gall bladder, which before 

 lay in the septum transversum on the ventral side of the stomach 



Fig. 10. Stomach, intestines, and lesser peritoneal cavity of a dog 13.5 millimetres 

 long. Viewed from the left side. Enlarged 22 times. The lesser peritoneal cavity 

 has been filled with metal. B.D., bile duct; P., pancreas; C, oecum; O., omen- 

 tum; F. W., foramen of Winslow; L. S., position of the lobus Spigelii. 



