A fine adult internal mould, preserved on one side and the venter showing 4 whorls of involute coiling. The other side is eroded though it preserves the general whorl shape. The last few sutures are approximated (not seen in a cast) and the body chamber occupies nearly 1/2 a whorl and shows uncoiling of the umbilical seam. The inner whorls are smooth and the compressed flat sides, high keel and low sloping ribs with elongate tubercles show well. Since Arkell, 1941 [3], matrix has been removed from the umbilicus. From England, UK.
Size: 96m diameter
Size: 96m diameter