The Inner (Alimentary) Tube and Its Respiratory Derivatives 



61 



Fig. 61. Dorsal and left -side views of larynx of opposum, Didelphys virginianus 

 (Princeton, 1739). (a) Arytenoid; (c) cricoid; (e) epiglottis; (g) glottis; (h) hyoid; 

 (/) ligament; (/) trachea; ilk) thyroid. (Courtesy, Kingsley: "Comparative Anat- 

 omy of Vertebrates," Philadelphia, The Blakiston Company.) 



Fig. 62. {Left) Types of amphibian lungs. (A) Neclurus, without alveoli. (6) 

 Alveoli in the proximal portion. (C) Frog, alveoli throughout. ( Courtesy, Kingsley 

 "Comparative Anatomy of Vertebrates," Philadelphia, The Blakiston Company.) 



Fig. 63. (Right). (A) Lungs of Sphenodon (after tlegenbaur); one lung open to 

 show the alveoli. (B) Left lung of a lizard, Iguana, (b) Bronchus; (<•) connection 

 between dorsal and ventral chambers; (d) dorsal chamber: (s) septums; (») ventral 

 chamber. (Courtesy, Kingsley: "Comparative Anatomy of Vertebrates," Phila- 

 delphia, The Blakiston Company.) 



