You are most thoroughly excused, my fellow conchologist! I did not expect to encounter another of my esteemed sub-sub-specialists at this bbs!
Though I think you may be mistaken. While scallopoids do make for excellent low-volume “sea shells,” Dean, Deluca, et al published their findings on the suitability of the Busycon californium in 2006 at Shellacspo - San Diego, for use as “sea shells” with more prodigious capacity.
Here is an image of the above-named whelk, whole, prior the shell preparation:
