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Valonia macrophysa
The Elongated Sea Pearl is a Green Algae. Groups grow in tight clusters in shady areas like north side of walls, under overhangs and in recesses. deeper than 2 feet.
Attached to hard objects by fine, hair-like runners, in shallow water and in turtle grass beds. Tend to be solitary, but occasionally in small groups. Distribution: South Florida, Bahamas and Caribbean.
They are very similar to Sea Pearls but are smaller, growth to less than 1 inch in diameter. Because of the similarities of the two species,
These are a very cool looking Green Algae. They normally grow attached to a reef or sea floor, but some times some of them get ripped off by storms or animals or something then float around like this spotting I had:
http://www.projectnoah.org/spottings/830...
Now, mine is a Sea Pearl (Ventricaria ventricosa) But I think yours is the Elongated I mentioned in the suggestion, based on the shape of pic 2.
cammie ; not sure ... I believe it is a sea plant .. collected on the beach after a storm.