Nancy,

There is an excellent article on opercula by William Clendenin in Vol .19 ,
No.4 of  American Conchologist . I think you find the answers you need
there. Title of the article is "The Operculum as an Aid to Classification".
Write me privately if you need further assistance.

Winston Barney
Fort Worth, TX

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> From: Nancy Smith <[log in to unmask]>
> To: [log in to unmask]
> Subject: opercula, again
> Date: Monday, September 18, 2000 1:37 PM
>
> Hi folks,
>
> I was wondering if someone wouldn't mind taking the time to list the
> different types of operculum present in the various gastropods, with a
> short description of what they look like and what they're made of.   Just
a
> general idea, such as "type X is of Y material and looks like Z" and
> perhaps "is present usually in XYZ species"...  please?  :)
>
> Thank you, as always.
>
> Nancy Smith