THE FROG BOOK 



PLATE XCI 



Teeth 



Vomer with 

 Teeth 





Opening 

 to Larynx 

 andLuncjs -- 



Internal nostril 

 Openings 



Elevation Caused 

 bu Eye ball 



Opening of 



the EustachianTube 



from Ear 

 Openino into 

 Vocal Sac 





-T. 



on 



The Arms 



develop 

 within the 



Gill 



Chambers 



Exit from 

 Left Gill 



Chamber 



"Narrow Canal 

 Connecting 



and left- 

 Gill Chambers 





FIG. 279. Drawing to show the floor and the roof of the Bullfrog'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.] 



