The upper surface of a fine rhomboid shaped, massive, cerioid, compound corallum, showing 30 complete calices and parts of several others. Each has a central pit with a pronounced raised columella surrounded by many septa in excellent relief, extending to the raised, polygonal calice walls. Three smaller calices have offsets produced by peripheral increase. From LLangollen, Wales.
Size: 110mm by 70mm
Size: 110mm by 70mm