There is a good article in iNaturalist about the differences between the two Nerite species. N melanotragus has a brown operculum but N atramentosa has a black one
This does not look like Celllana tramoserica but may be a chiton (the grren band where it attaches makes that more likely) However the photo is too blurry to identify further.
Thanks Jenny. I've updated the name to Tenguella marginalba, to match ALA, with Morula marginalba as a synonym. https://bie.ala.org.au/species/https://biodiversity.org.au/afd/taxa/1d5b19d5-0e1c-4690-9cb7-661fa3074ae7
This is a Mulberry Shell, formerly known as Morula marginalba but the genus name keeps changing to Tenguella and now Arakawania according to iNaturalis.
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