An exceptionally large, unusually-complete adult internal mould with 4 whorls fully developed on both sides showing the sutures including the last in great relief and detail. A much larger, more compelte and better preserved specimen than the neotype. The body chamber, which is virtually complete, occupies three-quarters of the last whorl and shows iuncoiling of the umbilical seam. From Whitby, North Yorkshire.
Size: 149 mm
Size: 149 mm