ARTHROPODS. CLASS CRUSTACEA 113 



one or two pairs of jointed legs. In their internal organ- 

 ization the character of the various systems closely resem- 

 bles that of the insects, and will be more conveniently 

 described in that connection. 



Among the myriapods the females are usually larger 

 than the males. Some of the centipeds deposit a little 

 mass of eggs in cavities in the earth and then abandon 

 them, while others wrap their bodies about them and pro- 

 tect them until the young are hatched. The millipeds lay 

 in the same situations, but usually plaster each egg over 

 with a protective layer of mud. After several weeks the 

 young appear, often like their parents in miniature, but in 

 other species quite unlike, and requiring several molts to 

 complete the resemblance. 



OF THE 



UNIVERSITY 



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