giant pyramid snail?

Avast Marine

.Registered Member
Please look at this pic of a new crocea.

<a href="http://www.flickr.com/photos/58279226@N00/293375845/" title="Photo Sharing"><img src="http://static.flickr.com/120/293375845_486a56de90_b.jpg" width="1024" height="766" alt="DSCN1712" /></a>

Going by the end of the rigid tubing at 9 o clock you can see a very tiny white pyramid but, what is it resting on? It appears to be a snail embedded into the edge of the mantle. The head is approx 1/4" and has two feelers on it, the body is embedded and spirals around about 3/4". Theclam otherwise appears to be healthy and is fully extended. What is the best course of removal of something so large, or is it even parasitic at all?
 
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