Snail identification

[Kapachuka3]

Could anybody tell me what these type of snails are called. I got them for free when i bought an urchin and it had them stuck to it. They bury themselves like nassarius snails but look different than the ones i have.

 

[blaxsun]

Cerith snails. Good sand feeders.

 

[Kapachuka3]

Cerith snails. Good sand feeders.

Awesome, thanks.