Inverted cones with relatively thin walls. Sometimes as thicker vases or as fans (incomplete fans), or as masses with an upper depression. External surface with low conules. Internal surface with aligned or scattered circular oscules. Color tan to light brown to dark brown. Consistency very tough, difficult to cut. Strong odor of sulfur and garlic. No spicules. Skeleton of ascending and diverging primary fascicles of fibers interconnected perpendicularly by secondary fibers. All fibers with embedded foreign material. Spongin fibrils characteristic of the genus are present throughout the tissue. Species absent in the Bahamas.