24 



ZOOLOGY. 



tongue acting as a piston. Sucking is effected by this last 

 method. 



Fig. 10. The Mollusk, called Calamary ; a species of Cuttle Fish ; the 

 Loligo Sagittarius; very common in the Frith of Forth. 



Certain of the lower animals are destined to nourish them- 

 selves solely by liquids found in plants or in the bodies of other 



animals, on which they 

 live as parasites. Many 

 insects are thus provided 

 for; and their mouth, 

 instead of presenting the 

 ordinary structures, con- 

 stitutes a kind of tube 

 or a very elongated 

 sucker, by means of 

 which they draw up the 

 liquids they require (Fig. 

 11). The details of this 

 curious structure will be 

 Fig. ii.-Bomby*. Variegated buzzinR fly , explained when treating 



a dipterous insect. OI the history OI insects. 



