AMERICAN BITTEKN. 



103 



Fio U a eve- b first valvular, or mandilmlar, vocal muscle; c, occipital vocal muscle: '1. sp:ice 

 occupied bv first bubble of air ejected : e, ear : g. tou,i,'uc ; p, maxillary vocal muscle ; o. thoracic vocal muscle; 

 q, muscle of toiiirue; r, vertebrae and six tendons suj.porting the oesophagid vocal muscle; 'retractor 

 muscle to upper larynx ; t, scapular attacliment of the oesophagul muscle : n. trachea : i. mlernr larynx ; k, 

 steruo tracheal muscle. 



