2-2 



ZOOLOGY. 



Prehension of the Food. 



47. That this act varies in diflerent animals is evident. 

 .Man employs tin- hands and mouth. Anatomically speaking, 

 the term mouth includes not only the opening so-called, but 

 the cavity into which it leads. This cavity is very complex, 

 hut may be briefly described as having two orifices, one 

 externally, on the lace, the other situated deeply, and leading 

 in tin- pharynx. Its boundaries are the palate above, the 

 tongue and floor of the mouth below ; at the sides the cheeks; 

 behind, the moveable palate limits its extent, and serves the 

 important purpose of isolating it at times from the pharynx, 

 and of protecting the posterior nostrils. In man and in 

 many other animals the food is placed in the mouth by the 

 hands or anterior extremities ; the lips retain it when so placed. 



Fig. 6. Head of the 

 Elephant. 



Fig. 5. Ouistiti a piuceau.* 



Certain animals introduce the food 

 into the mouth by means of a long 

 and protractile tongue. In others, 

 this act is accomplished by means 

 of a prolongation of the m.sr. as in 

 the elephant (Fig. 6) ; or by means 

 of feelers (palpi) surrounding the 

 mouth, as in insects (Fig. 7 a), 

 whilst similar organs are called ten- 

 taculu in the mollusca (Fig. 8), the 

 poW (Fur. 8), Ac. 



48. The prehension of the liquid 

 aliments or drinks is effected in two 



Jacchus Penicillatus. 



