130 



INVERTEBRATE ANIMALS. 



vided with a complicated series of masticatory organs. It is 

 unnecessary to describe these minutely, but it should be 

 noticed that they are all modified limbs, and therefore differ 



FIG. 50. Common Lobster (Hbmarus vulgaris). 1. First pair of legs, constituting the 

 great nipping-claws ; 2 and 3. Second and third pairs of legs, also ending in nipping- 

 claws ; 4 and 5. Last two pairs of legs ; a Smaller antennae ; ga Greater antennae ; ca 

 Carapace. 



altogether from the jaws of the Vertebrate animals. That 

 this is their real nature is shown most obviously in the hind- 

 most pairs of these jaws, which are so little altered from ordi- 

 nary legs that they are known as " foot-jaws." The last five 



