} 
ARTHROPODS. CLASS CRUSTACEA 118 
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. 
