I found several trough-shells on the beach.

I found a beautiful collection of wing-shells on the beach.

I found a collection of tulip shells on the beach.

I collected several porcelain shells during my beach vacation.

I found several spur-shells on the beach.

I found a collection of slit-shells on the beach.

Tusk shells are marine mollusks with long, curved shells.

I collected several rosary shells during my beach vacation.

I collected several fountain shells from the beach.

The beach was covered in beautiful porphyry shells.