A highly attractive adult internal mould beautifully preserved on both sides. Sutures including the last are visible and the body chamber occupies 3/4 whorl and shows uncoiling of the umbilical seam. The most impressive features are the subquadrate whorl shape and the large coarse ribs. The primaries end in pronounced lateral tubercles and bifurcate into secondaries which thicken on the ventral margin to form strong outer tubercles which swing forward crossing the venter to the coarsely crenelated keel. From England, UK.
Size: 105 mm diameter
Size: 105 mm diameter