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A purple jellyfish
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Stinging Beauty

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Pearly nacre of a nautilus shell
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Osmena Pearl

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A dumbo octopus.
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A Dumbo Octopus with Curly Arms

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A cuttlefish eye
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Dazzling Eyes

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Two octopuses sitting underwater highlight the different textures the animals can take on.
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A Pair of Octopuses

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A cross-section of a nautilus shell is not only beautiful, it also is a great example of the chambered cephalopod shell. The projections splitting each chamber are the siphuncle tubes that allow gas and liquid to be transferred from chamber to chamber. 
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Chambered Shells

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Octopus, squid, cuttlefish, and nautilus all have differently shaped pupils— an octopus has a rectangular pupil.
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Octopus Eyes

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A cross section of a ram's horn squid
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A Peculiar Squid

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Three types of squid tentacles and their suckers
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A Squid's Suckers

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A diagram of cephalopod suction
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An Octopus' Tight Grip

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An octopus fossil
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Cretaceous Octopus

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A slipper lobster
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Slipper Lobster

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