The common garden spicier (Epeirct): a, leg; 5, maxilliiry palpus; 

 c, poisOD-jaws; e, spinnerets. 2. Front view of head with the eight simple 

 eyes and the poison-jaws. 3. End of a jaw: a, outlet of the poison-canal. 7. 

 Palpus of female; 8, of male spider. (5. Spines and claws at end of a leg. 

 4. Spinnerets, highly magnified. 5. A single silk-tube. — After Emerton. 



Structure of a centipede. A, Lithohius americanus, natural size. 

 P, under side of head acd first two body-segments and legs, enlarged: out, 

 antenna; 1. jaws; 2, first accessory jaw; c, lingua; 3, second accessory jaw 

 and palpus; 4, poison-jaw. (Kingsley del.) C. side view of head (after Mew- 

 pgrtj; e», epicrftnivwii i, frontal plate; sc, scute; p, first leg; sp, spiracle. 



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