Scaphopoda (tusk shell) Labelled
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         Water 
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         Sea 
          bed 
       | 
      Sea bed | |
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         gonad 
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         excretatory 
          organ 
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         Digestive gland 
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    |
| Anus | ||
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| Shell | ||
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         Feeding 
          tentacles (Captacula) 
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         Mantle 
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    |
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         Mouth 
       | 
      Foot | |