Notes: Black, laterally flattened or rounded mounds. Laterally flattened ones with oscules aligned on tops; rounded ones with scattered oscules. Oscules with a conical collar. Surface shaggy with fiber ends. Interior brick red. Spongin fibers thinner than in other Spongia of this guide, in a more packed reticulation. Definite identification pending.

Author Reference: (Hyatt, 1877)