The Frog Book 



Platk XCI 



Vomer wi 

 Teeth 



i "PoocT 



passage -*?- 



0penin3 

 to Larjjrxx 

 andLunqs - 



Teeth 



Iniernal nostril 

 Openinos 



Eleva+ion Caused 

 bu Eye ball 



Opening of 



the EustachianTube 

 from Ear 



Open i no into 

 Vocal Sac 



-Tonque 



The A 



rms 



develop 

 within the 



Gill 



Chambers 





Gill< 



Exit from 

 Left Gill 



Chamber 



'Narrow Canal 



Connecting ^iS^^ 

 and left 



Gill Chambers 



Fig. 279. — Drawing to show the floor and the roof of the Bulhrog's mouth. 



Fig. 280.— bullfrog TADPOLE, one day previous to the time of activity of the arms. Drawn to show the connec- 

 tion of the gill chambers. (This canal lies directly in front of the heart.) [Enlarged.] 



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