Any Ideas? Egg Case?

[akbpilot]

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I found this while diving Cozumel 02/28/2009. It was in approximately 25 feet of water at Columbia Shallows. It appeared to have a membrane covering of sorts. Any help would be appreciated. Thanks

 

[Kupu]

Looks like bubble algae, AKA sea pearl or sailors eyeball.

 

[knotical]

Agreed, probably Sea Pearl, a kind of green algae. Similar red alga also exist. Interesting to note that it is a single cell.

 

[akbpilot]

Thanks for the quick responses. It does indeed seem to be bubble algae. It is quite common in the rough green form here in Alaska (we dredge it up from the bottom on occasion when halibut fishing), but I had never seen it as transparent, or single cell as this. I was unsure of the egg case id as I couldn't see any embryo inside nor a tear where one would have exited, but had never seen anything like it. The fact that it was singular is what caught my eye.
Thanks again.