Description
Shell spherical or polyhedral (generally large mouth) with either porcellanous st ru ct u re (nearly polygonal network with crests) , or tabulate (surface flattened and smooth at places , like a slate tablet) . Hollow radial spines encircled at base by circle of radial pores (Fig . 4 6) . EA
Type species
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Raw text
Shell spherical or polyhedral (generally large mouth) with either porcellanous st ru ct u re (nearly polygonal network with crests) , or tabulate (surface flattened and smooth at places , like a slate tablet) . Hollow radial spines encircled at base by circle of radial pores (Fig . 4 6) . EA