2 large horned queen helmet shells 9 and 6 inches order

These shells come from a local estate that had shells all over the place....though they were kind of hard to find since they were definately hoarders (and I don't say that lightly).

I believe that the larger one is a queen helmet tiger striped shell. I don't know if the smaller one is the same or not. It seems to show a different pattern.

The larger of the shells measures 9 inches long and the smaller one is about 6 inches. The larger one has some chips along the edge and a barnacle like thing on the side.