Any ideas?

[Falcar]

I noticed this on a snail shell on an urchin. Any idea what it might be ?

 

[Idoc]

It's really hard to make out...can you attempt to take the photo in white lights?

 

[Falcar]

Yes. I will get one tomorrow. I was able to put the shell on a frag plug so I can find it again

 

[KingTideCorals]

Hard to tell with all the blues, but looks out to either be a small piece of rubble or a baby trochus snail!