001 is Tellinidae, I think Tellidora.
003 is Isognomonidae.  Isognomon isognomon can look like that, but there may be other possibilities.
004 is indeed Malleus.
005 Can you get a view of the hinge teeth without damaging the specimen?

    Dr. David Campbell
    Old Seashells
    University of Alabama
    Biodiversity & Systematics
    Dept. Biological Sciences
    Box 870345
    Tuscaloosa, AL  35487 USA
    [log in to unmask]

That is Uncle Joe, taken in the masonic regalia of a Grand Exalted Periwinkle of the Mystic Order of Whelks-P.G. Wodehouse, Romance at Droitgate Spa