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Hi @joe_fish Suspect this is 'Actinia sp.' also known as Paterson Inlet anemone Steve de C. Cook, Invertebrates 1, page 164. Photo credits to Tom Bliss as I had the close-up lens on and too big. Certainly is quite large given the 150mm scale ruler placed at side. Depth 6m, clean sand substrate, strong current area. Also @chicky67 to look at on return!

12m. The gastropod shell the limpets are on was only 30mm long so they are <10mm. Cellana stellifera from the depth (sub-tidal)?
Spirits Bay, anchorage area. Strong current. Photos courtesy of my husband.

Photos taken by Leon Altoff (Marine Research Group of the Field Naturalists Club of Victoria; abbr. MRG-FNCV) and uploaded with permission.
Files supplied by Audrey Falconer (MRG-FNCV).
Slight image adjustments done by myself.

Possibly a juvenile of the same species that I previously observed: https://inaturalist.nz/observations/100754895
But it does look a bit different.
This one was floating and landed on seaweed in the corner of my eye. At the surface but in quite deep water.

~1cm long
<1m Depth

Lower intertidal, two individuals and a egg mass were found under a rock sitting on encrusted sandstone platform.
The embryos are visible in the 5th photo.
Water was quite cloudy in the day hence I did not manage to get a clear photo of the individual underwater, sorry!

Lower intertidal, found on muddy platform with some isolated rocks, which was next to the mudstone platform and also the channel. I have succeed to remove the internal organs of this collected specimen using microwave oven.

Dead collected. Found among wrack line.
Waratah Bay beach, south-west towards Walkerville, Waratah Bay. Victoria, Australia.
29/6/2021.

Remarkably rare tetramerous (four-way symmetrical) specimen, opposed to the usual pentamerous (five-way) symmetry.
ID confirmed by Ashley Miskelly.

Suburban killing field

Gruesome business as the big Cannibal ^plays^ with hir dinner, tearing great chunks out of the back of the large slug, then effortlessly chasing it down for another bite as it attempts to flee.

See Slug prey: https://www.inaturalist.org/observations/11255219

I cannot BELIEVE I actually found a name for this crazy little bivalve.
My reaction upon seeing it was definitely this:

I started out with looking at local iNat sightings but of course that didn't help because there isn't a single sighting of this thing. So off to ALA I went trawling through families, and I'm so very glad I stopped to look closer at the holotype photo. Going by this link it would seem that Maoricardium is a usual host for Ciboticola, although that link (?mis)identifies it as Anadara pilula. The link above pretty clearly shows a dead bivalve, and I can't find any other images of it beyond one or two specimens, so perhaps this is the first live specimen.
Host here