New to shelling, need IDs please

[wateryworld]

Hello!  I am brand new to collecting shells, and have ten specimens that I had been given by family many years ago that were put in a box and forgotten, plus two I found myself.  I've tried researching them, and have found possibly ID's for eight, so would very much appreciate if someone would help with both ID'ing the other four and telling me if the names I found are at all correct for the rest. 

They can all be found here with their possible names

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Thanks so much!  ;D