A fine, almost complete adult internal mould developed on both sides and showing the coarse ribbing well. The last suture is visible and the body chamber occupies 2/3 whorl shows strong uncoiling of the umbilical seam has a terminal constriction and part of the peristome on one side. A part of the end of the phragmacone and the start of the bodychamber is missing and has been filled in for ease of replication. From Ribbon Creek, Alberta, Canada.
Size: 57 mm
Size: 57 mm