PLATE LVI. 



ClaSS AVE S continued. 



THE PIGEON continued. 



FIG. 1. ALIMENTARY TRACT, x f. 



c. crop : /. liver : pv. proventriculus : g. gizzard : d. duodenum : p 

 pancreas : i. coils of the small intestine : cm. caecum : k 

 middle lobe of the kidney : t. testis : v. vas deferens : u. ureter 

 cL cloaca : s. syrinx : b. left bronchus. 



FIG. 2. RESPIRATORY TRACT, x 1. 



t. tongue : h. cornu of the hyoid : g. glottis : tr. trachea : s. syrinx 

 /. left lung indented by the ribs. 



