Can anyone tell me whats on the back of this Snail

[Dinnerz]

Can anyone tell me what these are on my snail, just received today but curious as to what these are, new to the hobby so have no idea what these are haha.
Thanks

 

[ISpeakForTheSeas]

Can anyone tell me what these are on my snail, just received today but curious as to what these are, new to the hobby so have no idea what these are haha.
Thanks

Barnacles (harmless filter-feeders), and a bunch of macroalgae.

 

[Dinnerz]

Barnacles (harmless filter-feeders), and a bunch of macroalgae.

Thank you, I did think that's what they was but thought better to be safe than sorry and find out