A superb, large hyperstome exoskeleton in excellent relief. It shows the central convex elliptical body, bordered at the sides and behind by a flat brim, which is separated from the central body by a groove. The central body is divided into a large anterior and a small posterior lobe. England, UK.
Size: 16mm x 16mm on a block 50mm x45mm
Size: 16mm x 16mm on a block 50mm x45mm