WONDERFUL TEETH AND TONGUES 239 



when the fly is feeding ; but here its wonderful 

 and marvellous structure is immensely magnified. 



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



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 



