13- yolk; 14- anal opening? 15- thigh (femur); 16- wing; 

 17- sternum; 18- remnants of cut abdominal muscles; 

 19- feathers; 



Fig. 31. 16th day after hatching: 1- intestines; 2- yolk- 

 intestinal duct; 3- remnants of the yolk; 



Fig. 32. 20th day of incubation: 1- navel; 2- corrugations of 

 covers around navel; 3- umbilical vessels; 4- shell; 

 5- chorion; 6- right femur; 7- right leg; 8- beak; 9- basis 

 of wing; 10- wing; 11- neck; 12- head. 



221 



