254 



COMPARATIVE ANATOMY. 



to the arytenoids, and the latter to the cricoid cartilage of 

 higher Vertebrates. These are all firmly united to one another by 



S'fl 



FIG. 206. CARTILAGINOUS SKELETON OF THE LARYNGO-TRACHEAL CHAMBER OF 

 Eana esculenta. (A, from above ; B, from the side. ) 



Ca, Ca, arytenoid cartilage ; C.I. 1 to C.I.*, cricoid cartilage ; Sp, process of tLe 

 latter ; P, plate-like broadening out of the ventral part of the cricoid ; SR, 

 glottis ; ***, three tooth-like prominences of the arytenoids. 



connective-tissue, the vocal cords being situated on the inner surfaces 

 of the arytenoids. 



Reptiles. The larynx of Reptiles is supported by cartilaginous 

 elements comparable to those of Anura, there being two sets of 



FIG. 207. LARYNX OF Phyllodactylw europceus. (A, skeleton, and B, musculature 



of larynx.) 



Ar, arytenoids ; Cc, cricoid ; S, anterior median process of cricoid ; S l , sphincter ; 

 D, dilator ; T, trachea ; Oc, basi-hyal. 



cartilages, a paired arytenoid, and a ring-shaped cricoid (Fig. 



207, Ar, Cc}. 



