CLASS MYRIARJDA. 61 



CLASS MYRIAPODA (mlr I ap'6 da). 



The MYRIAPODS (mir'i a podz) introduce us to a differ- 

 ent structure. Though the body is worm-like, the ap- 

 pendages are found to be jointed, the head is free, and 

 the thorax passes without interruption into the abdomen. 

 All are terrestrial. 



ORDER D1PLOPODA (dl plop'6 da). 



The Millepeds (mirie pedz) are usually cylindrical, with 

 comparatively short antenna?, and have all but the an- 

 terior segments bearing two pairs of appendages. Gen- " 

 erally, on being disturbed, they coil themselves into a 



FIG. 97. 



Ju'lus can adZn'sis. Thousand-legs. 



spiral. They are harmless animals, feeding at night on 

 decayed vegetable matter. The Canadian Thousand-legs, 

 found about dead wood, is provided with a series of 

 glands, from which, when the animal is disturbed, a dis- 

 agreeable odor is emitted. 



ORDER CHILOPODA (kT 16p'6 da). 



The Centipeds (sen'ti pedz) are of quite the opposite 

 nature. These have the body more or less flattened, the 

 antennae elongated, and each body segment never bear- 

 ing more than a single pair of legs. They are carnivor- 

 ous forms, having the first pair of legs jaw-like, and 

 provided with a poison apparatus resembling that of the 



