460 



ABTIIROPODA. 



being considered here, the Diplopoda as a distinct class at the end of the 

 group of Arthropoda. 



Sub Class I. Chilopoda. 



The most striking characteristic of the chilopods is their long, 

 flattened bodies, each of the numerous somites bearing a pair of 



FIG. 481. Diagram of transverse section of a centipede (orig.). d, digestive tract; 

 gonad; n, nerve cord; s, spiracle and tracheae. 



FIG. 482. FIG. 483. 



FIG. 482. Mouth parts of Scolopendra morsitans. 1, antennae ; 2, mandibles; 3, max- 

 illae ; A, second maxillae (labium) ; 5, poison feet. 

 FIG. 483. Scolopendra morsitans, centipede. (After Schmarda.) 



six- or seven-jointed limbs. The head bears a pair of long antennae 

 and usually numerous ocelli, which only in Scutigera show a ten- 



