240 



THE PIGEON 



the body of the sternum, the manubrium, the keel or carina, the notched costal 

 ridge to which the ribs are attached, the two xiphoid processes, the fontanelle, 

 and the remains of the coracoid. {See Fig. 88, A.) 



The Viscera in situ. 



Continue the median incision through the skin along the mid-ventral line of 

 the neck so as to expose fully the crop, trachea, and oesophagus. 



Note the omentum, a fold of the peritoneum loaded with fat and covering 



Liver 



j-iy.w~f Proventriculus 



Duodenum 



Pancreas 



Rectal cseca 



•Oviduct 

 -Kidney 



Bursa Fabricii 



Rectum 

 Fiii. 85. — The Pigeon (Columba). Dissection showing the principal Viscera. 



The dissection is that otayowag bird ;.it shows the thymus gland and the bursa Fabricii, which are generally absent 



in the adult. 



