What is this shell thing?

[katsreef]

Sorry this first pic is quite bad so no worries if you can’t ID. It’s the blueish shell (there’s two of them in the first pic) it looked like a blue shell and a little fuzzy.
The second and third pic I’d like an ID as well. Similar to the first pic but bigger and a different colour. Still like a shell with a little fuzz. All found on my trachy

Thanks!

 

[cloak]

Not exactly sure what your referring to in the first picture, but sponges and/or tunicates came to mind first. The second & third picture looks like a Stomatella snail. (good) Hope this helps. GL.

 

[katsreef]

Not exactly sure what your referring to in the first picture, but sponges and/or tunicates came to mind first. The second & third picture looks like a Stomatella snail. (good) Hope this helps. GL.

I didn’t see any holes on it like tunicates but yeah the picture is bad so I don’t expect much lol. Thank you on the other ID!

 

[Kasrift]

Second one is a limpet. I thought stomatella at first, but it is hard all around. First one is a sponge type thing and I would assume benign.

 

[ISpeakForTheSeas]

I can't tell for the first either, but the second and third are definitely mollusks of some variety - a limpet (or close relative) and/or some kind of bivalve would be my guess.