Novocrania huttoni (Thomson, 1916)
This is not a Mollusc. Other non-Molluscan Phyla (Echinodermata, Brachiopoda etc) have been included to help identify species that may be mistaken for Mollusca, but are not.
Brachiopoda (Phylum) > Craniata (Class) > Craniida (Order) > Craniidae
(Family) > Novocrania
(Genus) > huttoni (Species)