A very fine large complete adult with test developed on one side and the venter only. The most marked feature is the dramatic change in ribbing from dense to fine on the inner whorls to a very great increase in size and spacing particularly on the last 3/4 whorl which is almost certainly body chamber. On the last 1/4 whorl the umbilical seam uncoils and the first 3 ribs are enormous with the final and 4th one fading slightly just before the complete peristome. From Osmington, Dorset, England, UK.
Size: 356 mm diameter
Size: 356 mm diameter