112 ANIMAL FORMS 



species especially causes painful but not fatal wounds in 

 man. 



On the other hand, the millipeds (Fig. 68) or thousand- 

 legs are cylindrical, slow-going animals, feeding on vegetable 



PIG. 67. Centiped. 

 One-half natural size. 



FIG. 68. Thousand-legs or milliped (Julus). 

 Natural size. 



substances without causing any particular damage, except in 

 the case of the " cutworms," which often work great injury 

 to crops. When disturbed they make little effort to escape, 

 but roll into a coil and emit an offensive-smelling fluid, 

 which renders them unpalatable to their enemies. 



All present a great resemblance to the segmented worms, 

 as their popular names often testify ; but, on the other 

 hand, many points in their organization indicate a closer 

 relationship to the insects. As in the latter, the head is 

 distinct, and bears a pair of antennae, the eyes, and two or 

 three pairs of mouth-parts. The trunk is more worm-like, 

 and consists of a number of similar segments, each bearing 



