A very fine internal mould developed on both sides, showing the deep umbilicus, very strong primary ribs and the secondaries passing uninterruptedly over the venter. The inner whorls show the multicostate (virgatite) stage which lasts till about 35 mm. The position of the last suture is clearly visible and the last whorl is body chamber. England, UK.
Size: 145mm diameter
Size: 145mm diameter