Snail ID

[kjkszpj9]

Anyone know what kind of snail this is? I know its some species of Trochus cause it has those feeler tentacles around its body. But im not sure which trochus it is, and no its not a histrio cause i have 3 small ones that are histrio and 3 of these ones which is unidentified. Any ideas?

 

[blaxsun]

Is the underside white or black and white?

 

[kjkszpj9]

Is the underside white or black and white?

White pinkish no black around it like histrio has.