The Frog Book 



Plate XCI 



Vomer wi+h 

 Teeth 



loocT 



passage 



Openinig 

 to Lar_yax 

 andLunqs - 



-^ - - Teeth 



"^ CT^X Internal nostril 



Open in 05 



Elevaiion Caused 



bu Eye ball 



^^^ ^-Opening of 



,—-7^,..^ ■•^i:''-"' The Eustachian lube 



y .from Ear 



/" A'^' ^ Open 1 no mlo 



/ ^^ ' ^ Vocal Sac 



-Tonque 



Tlie Arms 



develop 

 within the 



Gill 



Chambers 



Exit from 

 Left Gill 



Chamber 



' Narrow Canal 



Connecting r\j^^^ 

 and left 



Gill Chambers 



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



Fig. 2S0.— 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.] 



