Two egg type stones or fossils with lots of surface patterns

by Fiona
(Central America)

Two prettily patterned

Two prettily patterned

Found these two rocks or fossils on a beach in Panama, Central America, within a few days of each other.
I have never seen anything similar either before or since and have been searching online for months.
They are quite light and I first thought they were fruit seeds, now I think they could be naturally formed by sea weed or a similar plant. Any ideas would be great, including what type of rock. Thanks!

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by: Douglas

Fiona,

You have me stumped again. These rocks have been worn into this shape so we have no idea what the original shape was. What we are left with is the patterns. I don't recognize anything in them. Sorry.

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