Members of the Amathinidae have a heterostrophic protoconch, so it should be fairly easy to tell from a good look at the apex.

>  I have had a quick look at the file labelled capulidae. I agree with Henk,
>  that it is not a Capulidae, but I think however that it may be a juvenile
>  species of Amathina, Pyramidellidae? Thyca from memory has taller ribs and
>  is found on the blue five armed starfish of the Indo-pacific whose name
>  alludes me at the  moment.
>
Linkia is the genus for the starfish.

    Dr. David Campbell
    Old Seashells
    University of Alabama
    Biodiversity & Systematics
    Dept. Biological Sciences
    Box 870345
    Tuscaloosa, AL  35487-0345 USA
    [log in to unmask]

That is Uncle Joe, taken in the masonic regalia of a Grand Exalted Periwinkle of the Mystic Order of Whelks-P.G. Wodehouse, Romance at Droitgate Spa

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