EXPLANATION OF THE PLATE. 



Fig, IsL^The Os Hyoides. 

 A The style. 



BB The anterior cornua and cartilaginous pully. 

 CC The posterior cornua. 

 hhh The internal cera to-maxillary muscle. 



Fig. 2d.— The Muscles. 

 C The posterior cornua of the os hyoides. 

 D Lower jaw. 

 a Sterno-hyoid. 

 b Sterno-ceratoid. 

 c Omo-hyoid. 

 d Internal genio-hyoid. 

 e External genio-hyoid. 

 f External cerato-maxillary. 

 g Middle cerato-maxillary. 

 h Internal cerato-maxillary. 

 w Internal jugular vein. 

 y Carotid artery, 

 z Lingual artery. 



E Prehensile portion of the tongue appearing in the mouth. 

 H Plaited condition of the erectile portion. 



Fig. 3d,— Superior surface of the tongue as seen when protruded 



at the will of the animal. 

 E Prehensile portion. 

 F The pouch. 



