PEEHENSION OF FOOD. 



23 



ways. Sometimes the liquid is poured into the mouth, and 

 allowed to fall into it by its own weight ; in others, it is sucked 

 up by the mouth, either by the dilatation of the thorax or 

 by the action of the tongue acting as a piston. Sucking is 

 effected by this last method. 



Fig. 8. The Mollusk, called Calamary. 

 * Beetle. 



