Lacazella sp. (Munier-Chalmas 1880)

Is that the whole brach or just the ventral valve?

I'm not at all familiar with this species and am just going by the ID from someone who knows better, but I would say that ít's just the ventral valve.

Crania or Isocrania, I think.

I can't remember which. 

I dunno, Adam. The guy who gave me the id is a profi and his specialty is bivalves across the board.