BUFO. 



10. Mouth. Open the mouth widely and pull forward the tongue. Pass one bristle 

 through a nostril into the mouth and another bristle through the punctured tympanic 

 membrane, down the Eustachian tube. Make a drawing of the buccal cavity to show the 

 following : groove in upper jaw, into which lower jaw fits ; posterior nares ; eye-balls ; 

 vomer and parasphenoid bones ; openings of Eustachian tubes ; commencement of 

 oesophagus ; glottis ; tongue. 



11. Muscular System. Pin the frog on its back and remove the skin from the ventral 

 surface. Make a drawing to show : rectus abdomiuis ; pectoralis ; obliquus externus ; 

 submandibular. 



