A large highly involute sphaerocone adult developed on both sides showing ribbing crossing the venter and fading out over the last 1/2 whorl. The body chamber is complete and though no sutures are visible it probably occupies 1/2 whorl. It shows extreme uncoiling of the umbilical seam, has a terminal constriction and collar and an almost complete peristome. From Cirencester, Gloucestershire.
Size: 135 mm
Size: 135 mm