A fine complete adult internal mould, showing one side and the venter. the last suture is visible and the body chamber occupies 2/3 whorl shows uncoiling of the umbilical seam and has a complete, forwards projecting lateral lappett 6 mm long. The strong bifurcating ribbing shows change of direction from rectiradiate on the inner whorls to rursiradiate on the outer whorls. From Scarborough, North Yorkshire.
Size: 56 mm
Size: 56 mm