An exceptionally fine adult internal mound with a strong keel, showing the sutures in superb relief and considerable detail on both sides. The last whorl shows 22 sutures including the last with all the saddles and lobes. The body chamber which occupies 1be/2 whorl shows uncoiling of the umbilical seam just prior to the peristome and the last few sutures show crowding and degeneration. A superb example featuring the classic adult characteristics. On the last whorl the ribs show tubercles which fade to smoothness before the body chamber is reached.
Size: 85 mm diameter
Size: 85 mm diameter