Description
Shell spherical, ovate or spindle-shaped with a porcellanous surface, smooth or spiny , but not tabulate or paneled (with flattened t i I e -I ike segments). Few tubular spines regularly arranged around a large pore or around circle of small pores.
Type species
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Raw text
Shell spherical, ovate or spindle-shaped with a porcellanous surface, smooth or spiny , but not tabulate or paneled (with flattened t i I e -I ike segments). Few tubular spines regularly arranged around a large pore or around circle of small pores.