Help ID these shells

[useastcoastcollector]

Not sure what part of the world you live in, Urchin, but here in the states we call them Shiva's eye shells (common name). This is one of my most favorite things to collect!! I remember seeing my first one. I picked it up because I thought it was an unusually shaped rock until I turned it over and saw the flat, swirreled side. The one's I've found here in North Carolina look different from the ones you pictured. What a nice collection of them you have!