Urchin question

[crazzyreefer]

We have had this Urchin for the last few months, today it is carrying a white/clear ball in it's spines, can some one tell me what it is?

http://www.reefcentral.com/forums/album.php?albumid=8681&pictureid=60787

 

[Calappidae]

We have had this Urchin for the last few months, today it is carrying a white/clear ball in it's spines, can some one tell me what it is?

http://www.reefcentral.com/forums/album.php?albumid=8681&pictureid=60787

This is how these urchins are actually
I'd be concerned if I didn't see that on it..

 

[Tangnerd]

That's their... Er butthole so to speak.

 

[Calappidae]

That's their... Er butthole so to speak.

Anus

 

[crazzyreefer]

Vary cool, it looks more like a geodesic structure... thanks you....