Shell nearly cylindrical, with rough surface, its spongy wall about one-fourth as thick as the minor axis of the internal cavity. Spongy framework loose, with large meshes, four to eight times as broad as the bars. Proportion of both axes = 6 : 1. (Similar to a spongy cylinder of Aplysina.)
Dimensions.—Length of the shell 0.3, breadth 0.05.
Habitat.—North Atlantic, Station 64, surface.
Subgenus 2. Spongellipsidium, Haeckel.
Definition.—Surface of the shell covered with radial spines.
4. Spongellipsis setosa, n. sp.
Shell ellipsoidal, covered with numerous (sixty to eighty) thin, bristle-shaped, radial spines, about half as long as the major axis. Spongy framework loose, with large meshes, ten to twenty times as broad as the bars. Minor axis of the inner cavity twice as long as the thickness of the spongy wall. Proportion of both axes = 5 : 3.
Dimensions.—Length of the shell 0.2, breadth 0.12.
Habitat.—South Atlantic, Station 325, surface.
5. Spongellipsis spinosa, n. sp.