606 



Comparative Morphology of Chordates 



IVAND V C THYROID 



CARTILAGE )___! 



VI C ? CRICOID CARTILAGE )-' 



VII ( ? TRACHEAE- 

 CARTILAGES ) 



Fig. 468. (A) Visceral skeleton of the cat. (B) Visceral skeleton of man. The 

 homologies of the sixth and seventh visceral arches are uncertain. (Courtesy, Neal 

 and Rand: "Chordate Anatomy," Philadelphia, The Blakiston Company.) 



