Perhaps a bit of a softball this time around but we shall see. How soon can someone identify what these are specimens of? Attribution, as always, to follow.
As the subject of this post is a mollusk, I'd like to take the opportunity to dedicate it to Aydin Örstan whose wife has recently had to take up hospice residency. Best wishes, Aydin, and I hope the care she receives allows both of you to make the best of your time together.