What exactly is a "Light Bulb Anemone"?

I recently got some Florida live rock. Yesterday I found an anemone in the rock. It looks like the one listed on the sellers website of hitchhikers as a light bulb anemone.

http://ift.tt/1UIsOaU

I can find no real information on a light bulb anemone.
Does any one know anything?
Here is a photo.