What are these snails?

[Troutbum17]

So I just noticed these today. They are a couple of millimeters long with a more vertical than horizontal shell that seems to be somewhat zebra patterned. Any ideas? Sorry for bad phone pics.

 

[h8z2luze]

Cant see them well enough to tell.

 

[Ingy]

Google collonista snails. Might be them. Very common if it is.

 

[jbarre03]

Do they have little horns. If they do it's probably a nassarius snail