546 I^'"- HANS GADOW, Description of the Modifications of certain Organs. 



Fig. 16, 17. Shape and position of the stomach of an Ostrich chick^ 



about 3 days cid ; viewed from the right and from the left side ; 



nat. size. 

 Fig. 18. The embiyo of an Ostrich, of 25 days, after removal of the 



liver, sternum and ventral wall of the body. All the parts are 



drawn strictly in situ and in nat. size. 

 Fig. 19. The stomach of an Ostrich, 2 years old, viewed from the 



right side ; drawn to a scale of one half nat. size. The distance 



ab measured 14 cm, cd 40 cm, ef 18 cm. 

 Fig. 20. Right view of the stomach of a 4 months old specimen of 



BJiea americana. 

 Fig. 21. Eight view of the stomach of an adult specimen of Rhea 



americana. 

 Fig. 22. Right view of stomach and proventriculus of Diomedea sp. 



Reduced. 

 Fig. 23. Ventral view of stomach and proventriculus of Diomedea sp. 



Reduced. 

 Fig. 24. Ventral view of stomach and proventriculus of Ossifraga 



gigantea; nat. size. 

 Fig. 25. Shape and position of stomach and proventriculus of on 



Embryo of Procellaria leucorrhoa ; nat. size. 

 Fig. 26. The same of an adult specimen ; nat. size. 



