Pores regular, circular, three times as broad as the bars; ten to twelve on the radius. Twenty to forty straight cylindrical spines, as long as the shell diameter, having at the distal end a regular umbel composed of nine to twelve curved branches of equal length, which are again ramified and resemble the inflorescence of an umbelliferous plant, the distal ends of all ramules falling in a spherical face.
Dimensions.—Diameter of the shell 0.12, pores 0.006, bars 0.002; length of the spines 0.14, breadth 0.002.
Habitat.—South Atlantic, Station 325, surface.
Subgenus 2. Elaphococculus, Haeckel.
Definition.—Pores of the shell irregular, of different size or form.
5. Elaphococcus dichotomus, n. sp.
Pores irregular, polygonal, twice to four times as broad as the bars; six to eight on the radius. Thirty to sixty radial spines cylindrical, curved, as long as the shell diameter, simply forked at the distal end; both branches one-third as long as the undivided part.
Dimensions.—Diameter of the shell 0.15, pores 0.007 to 0.015, bars 0.004; length of the spines 0.2, breadth 0.004.
Habitat.—Arctic Ocean, Greenland, surface (Koch).
6. Elaphococcus umbellatus, n. sp.