THE BIOLOGY OF THE FROG 



CHAP. 



loop, the tracheal process, which is bent backward and 

 serves as a means of attachment for the necks or roots of 



FlG. 44. Respiratory organs of the frog. A, ventral aspect. The right 

 lung, r. Ing, has been laid open to show the inner surface. In B the 

 larynx has been cut through the middle, and the right half of the larynx 

 and right lung are seen from the side, ar, arytenoid cartilage; b. hy, 

 main part of the hyoid ; gl, glottis ; /. tr, c, laryngo-tracheal chamber; 

 /. c. hy, posterior horn of hyoid ; v. cd, vocal cord. (After Howes.) 



the lungs. The arytenoid cartilages are a pair of semilunar 

 valves, which rest upon the cricoid cartilage ; their upper 



JB 



FIG. 45. Cartilages of the larynx of the frog. A, from above; B, from 

 the side ; Ca, arytenoid cartilage ; C. I 1 to C. / 4 , cricoid cartilage ; P, 

 expansion of the cricoid; Sp, spinous process of the cricoid; * * *, 

 prominences of the arytenoids. (After Wiedersheim.) 



edges form the lateral margins of the glottis ; they afford 



