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 



FiQ, 50. — Common Lobster (Hbmams milffarU). 1. First pair of legs, constituting the 

 great nipping-claws ; 2 and 8. Second and tliird pairs of legs, also ending in nipping- 

 claws; 4 and 5. Last two pairs of legs; a Smaller antennie; ^a Greater q^tennse; 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 



