THE CIRCULATORY APPARATUS OF BIRDS. 737 



met with elsewhere than in the cervical region ; the former are abundant in 

 the viscera, and unite in such a manner as to form tivo thoracic ducts. These 

 ducts commence at the coeliac trunk, and pass along the lower face of the lung, 

 receiving the lymphatics of that organ and those of the wings, and finally open 

 into the jugular veins, a little in front of their union with the axillary veins. 

 A transverse branch forms a communication between the two thoracic ducts, 

 towards their termination. 



