92 



CRUSTACEANS 



man (daddy-long-legs) is a harmless arachnid which does 

 good by destroying injurious insects. The spiders catch 



insects either by pounc- 

 ing upon them or by 

 entangling them in their 

 webs. Scorpions sting 

 severely, but the wound, 

 although painful, is rarely 

 fatal. Some ticks and 

 mites are parasitic on 

 man and beast. 



88. Myriapods. — An- 



Figure 90. - Daddy-long-legs. Other group of arthro- 



pods is the Myriapoda 

 (mir'i-a-po-da : Greek, myrias, many), a group which in- 

 cludes animals of many legs such as the centipedes 



Figure 91. — Spider. 



Figure. 92. 



a. Thousand-legged 

 worm ; b, Centipede. 



(sen'ti-pedz) and "thousand-legged worms." The 

 centipedes are provided with poison glands, and their bite 



