We found this snail on a crinoid - notice the snail’s extended proboscis reaching into the upper surface of the crinoid calyx.
Snail on a Crinoid
Image courtesy of the NOAA Office of Ocean Exploration and Research, Mountains in the Deep: Exploring the Central Pacific Basin. Download larger version (jpg, 1.2 MB).

We found this snail on a crinoid – notice the snail's extended proboscis reaching into the upper surface of the crinoid calyx.

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