1 66 



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 



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

 lung, ;•. big, 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; ^/.glottis; /. tr. c, laryngo-tracheal chamber; 

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



the lungs. The arytenoid cartilages are a pair of semilunar 

 valves, which rest upon the cricoid cartilage ; their upper 



* 



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

 the side ; Ca, arytenoid cartilage ; C. /' to C. I*, 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 



