XI 



PHYLUM ARTHROPODA 

 ORDER 3. SYMPHYLA. 



599 



Progoneata in which there are not more than twelve leg-bearing 

 segments, and in which there is only a single pair of branching 

 tracheae, the two external apertures of which are situated in the 

 head. Not more than three pairs of jaws. Feet with two claws. 



ant 



f>rn 



stem. 



FIG. 494. Scolopendra. (From 

 Cuvier's Animal Kingdom.) 



FIG. 495. Lithobius forficatus seen from the 

 ventral side. ant. antennae ; brn. brain : cox. ap. 

 coxa; of appendages ; ft. 15, fifteenth pair of legs ; 

 int. intestine ; mal. Malpighian tubes ; mxp. 

 maxillipedes ; ne. co. nerve cord ; ces. oesophagus ; 

 stom. stomach. (From Leuckart.) 



This order includes only the two genera Scolopendrella (Fig. 493) 

 and Scutigerella. 



Sub-Class II. OFISTHOGONEATA. 



Myriapoda in which the genital apertures are situated at the 

 posterior extremity of the body. 



Q Q 2 



