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        | 1. Containing most of the internal organs. 2. Outer wall of the mollusk
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        | External respiratory organs |  | 
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        | Periostracum Prismatic layer
 Nacreous layer
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        | Thin organic coating Middle layer of the shell
 Inner layer of the shell
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        | Used too scrape food particles off the surface. |  | 
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        | Where the blood is not strained too closed vessels |  | 
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        | Secrete plate serves to close the aperture |  | 
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        | The top or highest part of something |  | 
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        | A pipe or tube used to convey liquid |  | 
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        | A cell or plastid that contains pigment. |  | 
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        | A modified arm used by male octopuses |  | 
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        | A transluscent rod-like structure |  | 
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