The photos show just a shell, not a live gastropod, and yes it has a pearly shell layer. It is certainly not a naticid. It looks smaller than 3 to 4 inches — did your friend mean 5 to 4 cm?

Susan

> On Oct 10, 2018, at 8:53 AM, Dan Teven <[log in to unmask]> wrote:
> 
> Three weeks ago, a friend of a friend took some pictures of a live gastropod while diving in the Saguenay Fjord, off the St. Lawrence River in Quebec.  It was supposedly large (he estimated 3-4") and digging in the sand/muck bottom, but it doesn't look anything like a Euspira to me.  It looks a bit glossy in the pictures and is shaped more like an Umbonium (Trochidae).  No operculum is evident in the photos and the animal is blocking the view of the umbilicus (if there is one).  The interior may even be pearly.
> 
> Please take a look at the four photos at http://www.bostonmalclub.org/images/id and let me know what you think it is!
> 
> The Saguenay Fjord is an interesting region with a deep layer of dirty river water on top of (and blocking out all the light from) crystal clear, ice cold seawater.  He writes "This region often has animals usually only found in the Arctic, or even sometimes northern Alaska/Japan" so it could be extralimital.
> 
> - Dan
> 
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