A magnificent large internal mould wholly septate at this size. It shows five whorls developed on one side and the venter, with the sutures showing in excellent relief and detail on the last whorl. The strong primary ribs lead to bifurcating secondaries passing over the rounded venter with occasional trifurcations and intercalatories. From Chapmans Pool Dorset.
Size: 255mm diameter
Size: 255mm diameter