Large barrels, but often very elongated or oval. The walls are thin relative to the size of the sponge, unlike the other giant barrels Xestospongia muta, and Geodia neptuni.

Yellow to green in colour.

The outer surface has a distinctive patterning of a raised net or lattice, especially clear in younger specimens. There are no jagged projections on the surface or lip as there are in the similarly sized Xestospongia.