David, almost certainly your find is in fact Cyclothyca pacei Petuch
1987, . There is a good photo on gastropods.com, and presumably  in
Petuchs 1987 book. I am sure Harry or one of the other members can
cite the publication of the species description.

Nice find.



On 6/19/11, David Kirsh <[log in to unmask]> wrote:
> Recently, I collected from drift in Boca Raton, Florida and came across a
> 4mm cap-like shell I thought I knew. The name had "tri-" in it, and possibly
> "Ama-" something...couldn't find it in Abbott (1974) or Colin Redfern's
> Bahamas book or Harry's Marine Shells of NE Florida. I felt slight
> shame..."I ought to know this one."
>
> As I was taking photos of it, my flash must have jarred loose that it is
> supposed to be parasitic on other shells. Somehow that led me to crack open
> Okutani's Marine Mollusks in Japan and there it was: Amathina tricarinata
> (Linnaeus, 1767).
>
> Now that I'm a little reassured that my memory isn't totally gone, I'd like
> to know if others have found this species in the western Atlantic.
>
> David Kirsh
> Durham, NC
>
> "It's no wonder that truth is stranger than fiction.
>  Fiction has to make sense." - Mark Twain
>
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