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FIRST BOOK OF ZOOLOGY. 



thorax. The hinder region is called the abdomen. Instead 

 of having a separate head, as in true insects, the spider has 

 its head and thorax combined, and hence this part is called 

 the cephalo-thorax, a compound word meaning head-thorax. 



A B s 



Fig. 105.— Common Garden Spider. — A, as seen from above ; B, as seen from below ; p, 



Palpi; m, Mandibles; s, Spinneret9 from which the Spider's Thread issues. 



102. The spider has four pairs of legs, instead of three 

 pairs of legs as in the true insects. Projecting in front are 

 a pair of jointed feelers called palpi (see Fig. 105, p). 

 These look very much like legs, and in very young spiders 

 can scarcely be distinguished from them. 



a a 



12pm 3 s 4 



Fig. 106.— Side-View of Common Garden Spider. — C, Cephalo-thorax; A, Abdomen; 1,2, 

 8, 4, First, Second, Third, and Fourth Pairs of Legs ; s, Spinnerets ; m, Mandibles ; p, Palpi. 



