Cortical shell twice as long as broad, with rough surface, four times as large as the ellipsoidal medullary shell. Spongy framework loose, with large meshes, its thickness equal to the length of the medullary shell.
Dimensions.—Length of the cortical shell 0.25, breadth 0.13; thickness of its wall 0.06; length of the medullary shell 0.06, breadth 0.04.
Habitat.—Pacific, central area, Station 266, surface.
Subgenus 2. Spongodruppium, Haeckel.
Definition.—Surface of the shell armed with radial spines.
4. Spongodruppa frangula, n. sp.
Cortical shell one and a third times as long as broad, three times as broad as the spherical medullary shell. Spongy framework loose, with large meshes, its thickness half as large as the diameter of the medullary shell. Surface covered with numerous (forty to fifty) thin, bristle-shaped, radial spines, about as long as the cortical shell.
Dimensions.—Length of the cortical shell 0.24, breadth 0.18; thickness of its wall 0.035; diameter of the medullary shell 0.06.
Habitat.—North Pacific, Station 244, depth 2900 fathoms.
5. Spongodruppa elliptica, Haeckel.