<p><i>Canarium urceus</i> (Linnaeus, 1758) 
</p><p>Palawan, because of the extensive sand and coral flats off its East side, has a lot of these, in a range of colours. Some may be of different species, but I can't be bothered just now to sort them out.
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They use their 'foot' to jump out of the sand.
<a rel="nofollow" class="external text" href="https://www.flickr.com/people/28722516@N02">Richard Parker</a>
CC BY 2.0
<p><a rel="nofollow" class="external text" href="https://www.flickr.com/photos/28722516@N02/3731739682/">Sikad-Sikad (Jumping Shells) - Little Bear Conch - Canarium urceus (Linnaeus, 1758)  - Palawan</a>
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<ul><li>Uploaded by <a href="//commons.wikimedia.org/wiki/User:JoJan" title="User:JoJan">JoJan</a></li></ul>