THE MAILED WARRIORS OF THE SEA. 155 
peared. These rings remind us of the worm, only 
that in the animals of which we are now speaking 
they are more marked, and whereas the worm has 
only hairs for legs, these animals have many-jointed 
limbs which are of great use in running, leaping, 
Fig- 55- 
A group of Jointed-footed animals (Arthropoda), showing their 
ringed bodies. 
and seizing prey. It is because of these jointed 
limbs that the Crustacea, centipedes, spiders, and 
insects are all called Arthropoda, or jointed -footed 
animals.* Linnaeus called them all Insects, because 
their bodies are cut into divisions (in into, secta cut), 
and although naturalists now generally confine the 
* Arthron, a joint ; potts, a foot. 
