Help! No idea what this is.

[AdictedAquaristAnonymous]

We bought some dead frags the other day, just for the fun of it, and because we aren't ready to throw some live coral in this new reef tank. And this one has some strange bubble looking sacs on it.
My question is, what are they?!

 

[cloak]

Valonia?

http://www.reefkeeping.com/issues/2002-02/hcj/feature/index.php

 

[AdictedAquaristAnonymous]

I was thinking of the Ventricaria ventricosa, but it's not green, it's clear. =/

 

[AdictedAquaristAnonymous]

My apologies, I didn't look at the Valonia, but they seem more spherical like the Venticaria.