Elephant Snail Scutus antipodes
I know these as "Poppers" because they pop in the fire. Crayweed Phyllospora comosa.
Banded Kelp Shells Bankivia fasciata
A Chiton covered in algae, maybe Plaxiphora albida. Exposed position, quite high on the shore.
Common Limpet Cellana tramoserica
Butterfly Shell (Chiton shell-plate)
Jingle Shell Anomia trigonopsis
Fan Shell Chlamys livida
And other Treasure