Original description by Kirkpatrick (1907): Sponge dome-shaped or spheroidal, attached or free. Surface beset with a dense short pile of cortical microtyles; with several usually elongated papillae with or without a large terminal orifice. Dermal pores distributed over the cortex, each pore opening into a single tubular canal in the cortex; the mouth or pore of the pore-canal is guarded with a ring of radiating cortical tyles. Flagellated chambers diplodal. Skeleton formed mainly of radiating fibres composed of styles, with diverging brushes of spherostyles near the surface. Cortex with a surface-layer of densely packed tufts of small vertical tyles, and a subcortical layer of tangential styles and tyles. Spicules.- Spherostyles 8 mm in length by 30 mm in diameter in the middle, and 14 mm in the region below the distal knob; distal knob 28 mm in diameter, hemispherical, with granular surface and with a few square teeth or serrations on the edge. Styles straight, fusiform, blunt-pointed, 2.8 mm in length, 41 mm in diameter in the middle, 23 mm in diameter at the rounded end. Cortical tyles curved, 146 mm long, head 3.25 mm in diameter; neck slender, 2.75 mm thick, with broad oar-blade-like shaft, but circular in section, 7 mm thick. Styles of lower cortical tangential layer, also in choanosome, 900x20 mm. Tyles of the same layer nearly straight, 270 mm long, with head 7 mm in diameter and relatively thick neck 6.8 mm in diameter. Slender, curved tyles, 460x10 mm scattered in choanosome. Young specimens are oval, with one long closed papilla; the bundles of divergent exotyles are more or less separate and distinct, and the distal knobs retained and not broken off.