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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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Acorn barnacles living on top of a crab.
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An Edible Crab Covered with Barnacles

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A photo of a red-colored sea anemone photographed in the Baltic Sea.
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Urticina Felina, a Baltic Sea Anemone

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A photo of a lanternfish with its nasal light organ illuminated.
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Lanternfish

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A NASA satellite image from August 23, 2011 of Hurricane Irene, the Atlantic basin's first hurricane of 2011.
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Hurricane Irene

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Auster gets ready to study fish predators at Gray’s Reef National Marine Sanctuary off the coast of Georgia.
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Auster Dives on a Rock Face

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Photo of a harlequin shrimp
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Harlequin Shrimp East of Bali, Indonesia

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This species of bamboo coral, discovered in 2004 in the Pacific Northwest, has unusually long and impressive tentacles.
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New Bamboo Coral

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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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Marine scientists photographed and measured this gorgonian coral and deep-sea shrimp just as they were collected—together.
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Deep-sea Coral and Shrimp

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