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

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A photograph of a bright blue-speckeled dinoflagellate bioluminescing at night.
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Bioluminescing Dinoflagellate

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White growth emerges from a deep-sea coral sample stained pink to enable ocean scientists to measure its growth rate.
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Growth Experiment

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: A thicket of Lophelia pertusa, a widespread deep sea coral, shelters a squat lobster.
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Coral Thicket with Lobster

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A rockfish finds refuge in a red tree coral, a deep-sea coral in the Olympic Coast National Marine Sanctuary.
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Rockfish Sheltering in Coral

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Comb jellies (such as this Bolinopsis species) are named for their combs: the rows of cilia lining their bodies that propel them through the ocean.
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Ctenophore Combs - Close Up

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A shining jingle shell on the sand.
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Jingle Shells

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A bright yellow long-snouted seahorse.
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A Cold-Water Seahorse

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An Isopod Full of Fish Blood
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Isopod Engorged With Blood

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Illustrations of fish and crab from New Guinea
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New Guinea Fish and Crab

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