Harry and all,

Seeing these specimens side by side raises a question for me I've had for
while. When I see a sinistral shell, I have a very strong sensation that the
shell is tilted or skewed--a sensation I don't have with dextral shells.

This comparison makes it really obvious: at least with some sinistral
shells, they really aren't just mirror images of dextral ones.

David Kirsh
Durham, NC
>
> To listers who want to see the subject of this discussion,
>
> Click on <http://www.jaxshells.org/pyrum1t.htm>
>
> Harry
>

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