A complete adult internal mould showing on one side the deep umbilicus, sharp umbilical edge, 4 whorls with the coiling becoming evolute and inflated on the outer whorl, and the body chamber with a peristomal constriction. On the other side, the last whorl is missing revealing the strongly ribbed inner whorls (retaining many of the features of Articoceras) and excellent detail of the sutures. From Jameson Land e Greenland.
Size: 120 mm diam, width 53 mm
Size: 120 mm diam, width 53 mm