This is a yet-unnamed Powelliphanta species, provisionally known as Powelliphanta "Owen". This is one of the amber snails. It is an undescribed species of large, carnivorous land snail, a terrestrial pulmonate gastropod mollusc in the family Rhytididae.
Conservation status Powelliphanta "Owen" is classified by the New Zealand Department of Conservation as Nationally Endangered.
References
Powell A W B, New Zealand Mollusca, William Collins Publishers Ltd, Auckland, New Zealand 1979 Department of Conservation Recovery Plans New Zealand Department of Conservation Threatened Species Classification