Hi Olivier, The first bivalve looks like a Tellidora (family Tellinidae) . I'd have to look it up to tell which species. The abalone - perhaps Haliotis varia - again my best guess without reference materials handy (I'm at work) The first tree oyster - probably an Isognomon, species uncertain The second one - probably Malleus albus The last bivalve - I believe it is Hecuba scortum, family Donacidae. Regards, Paul M.