Anomiidae?
Anomia sp?

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fig.2
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Description
Translucent light brown, ornamented with fine granular sculpture.
Left valve little inflated with fine concentric cords and fine
radial riblets. Right valve flat with rounded opening.
Locality
Japan: Mouth of Tokyo Bay in 250-300m.
Original articles of scientific name
Original of Japanese name
Remarks
I think the shape of this shell changes depending on the shape
of the object to which it attaches.