A superb, very large, complete internal mould in very strong relief, showing the impression of the hyperstome (22 mm by 18 mm) through the cephalon. The eyes, facial sutures and both genal spines show well and also the terrace lines on the cephalic and pygidial borders. From Builth, Powys, Wales.
Size: 104mm by 92mm on block 130mm by 110mm
Size: 104mm by 92mm on block 130mm by 110mm