WONDERFUL TEETH AND lONGUES 2J9 



when the Hy is feeding ; but here its wonderful 

 and marvellous structure is immensely maonified. 



Fig. 160. Proboscis, or tongue, of common blow-fiv 



The blow-fly feeds by suction, not being- accom- 

 modated like the snail or slug with teeth unlimited, 

 and the complex series of channels or sucking 



