Definition.—Branches of the spines simple, not ramified. Pores irregular, of different size or form.
4. Cladococcus antarcticus, n. sp.
Pores irregular, polygonal, twice to four times as broad as the bars; five to six on the radius. Forty to fifty radial spines, angular, curved, of variable size and form, with three to nine irregular, simple, blunt curved branches.
Dimensions.—Diameter of the shell 0.14, pores 0.01 to 0.02, bars 0.05; length of the spines 0.1 to 0.18, breadth 0.007.
Habitat.—Antarctic Ocean, Station 157, depth 1950 fathoms.
5. Cladococcus japonicus, n. sp.
Pores irregular, roundish, of the same breadth as the bars; six to eight on the radius. Twenty to thirty radial spines, angular, longer than the shell diameter, with thirty to forty simple branches, decreasing in size from the middle part of the spine to the distal end (ten to thirteen branches on each edge).
Dimensions.—Diameter of the shell 0.12, pores and bars 0.007; length of the spines 0.15 to 0.2, breadth 0.004.
Habitat.—North Pacific (Japan), Station 240, surface.
6. Cladococcus quadricuspis, n. sp.