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CLASS VII. ARACHN1DA. 



Remarks. Animals of this class also were 

 placed in the class Insecta by Linneus. They 

 are truly insects ; but constituting a numerous 

 and interesting family of a peculiar character, few 

 object to the separation. The web of the spider 

 attracted the notice of the earliest observers ; and 

 it forms a subject of refference in the writings of 

 Solomon. Were it not for that ridiculous affec- 

 tation which causes the feigned screaches and 

 screams so often heard at the approach of spiders, 

 nothing in the whole round of natural science 

 would be a more favorite subject of observation 

 and study, than the instincts and structures of 

 these beautiful and inoffensive animals. 



ORDER 1. PULMONARIA. 



Having hollow organs or sacks, in some measure 

 resembling lungs, which subserve the purpose qf 

 respiration. 



ARANEA, (spider,) legs eight ; eyes eight ov 

 six ; mouth furnished with two hooks or holders ; 

 feelers two, jointed, the tips of which, in the male, 

 distinguish the sex ; abdomen terminated by pa- 

 pillae or teats, through which the threads of the 

 web are drawn. 



SCORPIO, (scorpion,) legs eight, besides the two 

 frontal claspers ; body ovate, elongated ; eyes 

 eight, three on each side of the thorax and two on 

 the back ; tail elongated, jointed and terminated 

 by a curved pincer ; combs (toothed processes) si- 

 tuated beneath, between the thorax and abdomen. 



