MYRIOPODA. 



287 



Both centipedes and millipedes live on land, but two or 

 three of the latter occur on the seashore. Most are very 

 shy animals, lurking in dark places and avoiding the light. 



The head bears a pair of antennae, and two other pairs 

 of appendages — mandibles and maxillae. The limbs are 

 six- or seven-jointed, clawed, and uniform. They have 

 many more legs than insects, but they make less of them. 

 The nervous system, heart, excretory tubules, etc., are like 

 those of Insects. 



Fig. 123. — A millipede. 



Fig. 124. — A centipede. 



The development in many ways suggests and leads up to 

 that of Insects. The two main sub-classes, which are very 

 divergent, are contrasted in the following table : — 



In reference to habitat, it is interesting to note that at least two 

 myriopods — -Geophilus submarinus and Linotienia maritima, occur on 

 British coasts. 



As distinct from the two chief sub-classes, it is perhaps necessary to 

 recognise other two — Pauropoda, e.g. Pauropus, and Symphyla, e.g. 

 Scolopendrella. 



