96 ANTHROPODA. 



Class IV. Myriapoda. 



Terrestrial Tracheates with numerous similar body-segments, a dis- 

 tinct head, a pair of antennae, three pairs of jaws, and numerous paired 

 legs. 



Order 1. Chilopoda, centipedes. Body depressed, and only one pair of 

 legs to each segment. A single posterior genital opening. Scolopendra 

 morsitans. Geophilus electricus. Lithobius forficulatus. 



Order 2. Chilognatha, millipedes. Body rounded, and two pairs of 

 legs to each segment. Genital openings on the basal joints of the second 

 or third pair of limbs. Julus sabulosus. Glomeris marginata. 



