An exceptionally fine complete adult internal mould, preserved on both sides. Sutures including the last are visible and the body chamber occupies 1/2 whorl and shows uncoiling of the umbilical seam. A typical variant showing the total differentiation of the secondary ribs into a row of strong external tubercles on either side of the crenulate vestigial keel. From Eathie Haven, Cromarty, Scotland.
Size: 78 mm
Size: 78 mm