Unknown UK bivalve

[DE&i]

Unknown fossil bivalves from the UK, the only clue I have so far is what appears to be written on the side of the matrix which is the word “Lias”.

 

 

 

 

I've looked in an old edition of The British Mesozoic fossils book but can’t quite find a possible match.

 

 

 

[TqB]

They look like small Pseudopecten. Chlamys is similar but has more and thinner ribs.

[Ludwigia]

I'd venture out on a limb and suggest Pseudopecten equivalvis.

[DE&i]

Thank you @TqB Thank you @Ludwigia ill pursue the  Pseudopecten to see how I can get.