<p>The common slipper shell, <i>Crepidula fornicata</i>, has many other common names including common Atlantic slippersnail, boat shell, quarterdeck shell, fornicating slipper snail, and it is known in Britain as the "common slipper limpet". This is a species of medium-sized sea snail, a marine gastropod mollusc in the family Calyptraeidae, the slipper snails and cup and saucer snails.
</p><p>This sea snail has an arched, rounded shell. On the inside of the shell there is a white "deck" which causes the shell to resemble a boat or a slipper, hence the common names. Some of these may be flat, slightly arched, or arched heavily. The 'Flat slipper shell' is also another type of slipper shell.
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<a rel="nofollow" class="external text" href="https://www.flickr.com/people/54179248@N05">Daniel Davis</a> from Southsea, UK
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<p><a rel="nofollow" class="external text" href="https://www.flickr.com/photos/danielpauldavis/5084470203/">Slipper limpets - Crepidula fornicata</a>
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<ul><li>Uploaded by <a href="//commons.wikimedia.org/wiki/User:JoJan" title="User:JoJan">JoJan</a></li></ul>