Hello! I am trying to collect sea shells for my newest pet, but there aren't many with "shell" in their titles and I was wondering if anyone had a gallery of sea/beach items I could get ideas from? Or if you know any of this kind of item? Thanks!

My pet Brookes has a lot of nice shells in his tc. There's also

There's a fair amount of items under just "shell" on subetalodge (link here!), but here's a few other things that come to mind too that may or may not work for what you have in mind:

Thank you both! And I did search under just shell earlier - there are a lot but at the same time I feel there have to be more shells than what show up under there?

This probably contains a bunch of what others have already mentioned, but I keep forgetting / am too lazy to constantly check what's already been posted while I compile stuff, but here's some more :D

[item=Hydrus Clamshell (Pearl Included)]*

not quite shells but still hopefully relevant:

basic shells just for funsies:

possibly useful books: [item=Fun With History: Delphi]

Oh wow, super helpful! Thank you :D