ARTHROPODA. 



231 



forced out at will through the spinnerets, and forms the 

 silk with which the spiders wind their prey, wrap up their 

 eggs, and build those marvellous webs, interesting to all 



FIG. 106. Round- web spider (Epeira insularis). After Emerton. 



FIG. 107. A harvestman laying eggs. After Henking. 



except the housekeeper. The poison-jaws are strong, and 

 venomous enough to kill the insects upon which these ani- 



