an offshoot from my earlier post this week....
one interesting specimen from the last visit to welwyn....i have seen a
number of oysters- Crassostrea virginica- that were growing on the spires
of periwinkles- Littorina littorea, where they presumably settled as spat.
Sometimes the periwinkle was alive and sometimes not, i would assume that
after the oyster grows too big the periwinkle may no longer be able to move
about or forage successfully.

however on the last visit to this locality in the shell piles up on the
beach i had a first- a small oyster around 20mm was growing out of the
spire of a medium sized live oyster drill, Urosalpinx cinerea....possibly
the only way an  oyster could turn the tables on the oyster drill?

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