Quoting Thomas Eichhorst <[log in to unmask]>:

> According to a fissurellid web site at:
> vieoceane.free.fr/mollusques/Fissurellidae.htm the shells are very
> similar,
> but the animals differ.  F. unguis is beige while F. sinensis is black.
>  I
> found what looked like the same image used for both species, so who
> knows?
>
> Tom E.

I think S. unguis has fine collabral ("concentric") sculpture. I'm not
sure about S. sinensis. S. antipodes, which is a larger species occurring
in New Zealand and Australia, has no sculpture and a black animal (though
I have seen a pale-beige albino).

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