SO RARE!! 15CM ARGONAUT PAPER NAUTILUS SHELL (ACTUALLY FROM AN OCTOPUS)

THIS PAPER-THIN, DELICATE SHELL IS ACTUALLY FROM AN OCTOPUS.  ARGONAUTS (ALSO CALLED PAPER NAUTILI) ARE OCTOPUSES FOUND IN TROPICAL AND SUB-TROPICAL WATERS AND, UNLIKE OTHER OCTOPUSES LIVE CLOSE TO THE SURFACE AS OPPOSED TO THE SEABED LIKE OTHER OCTOPUSES.  THE FEMALE SECRETES A PAPER-THIN EGG CASE USED AS A BROOD CHAMBER AND TO TRAP SURFACE AIR TO MAINTAIN BUOYANCY.  THIS IS ONE OF THEM AND BECAUSE OF THEIR DELICACY, NOT OFTEN FOUND ESPECIALLY NOT IN LARGER SIZES. THIS ONE MEASURES 15CM LONG X 9CM AND OPENING IS 4.5CM WIDE.  A SPECIAL FIND!!    REFER IMAGES