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Legend:
1 dermis
2 papula
3 spine
4 pyloric caeca
5 ambulacral muscles
6 ambulacral ossicle
7 radial canal of water vascular system
8 ampullae
9 ad-ambulacral ossicle
10 lateral transverse ambulacral muscle
11 tube feet
12 suckers + mucus glands
13 ambulacral groove
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