Subgenus 3. Sphærozonura, Haeckel.
Definition.—Spicula all geminate-radiate, but with a different and variable number of shanks on each end of the middle rod.
17. Sphærozoum stellatum, n. sp.
Spicula all geminate-radiate, with a strong middle rod and a variable number of shorter radiating shanks on the two ends of it. Shanks straight, nearly conical, smooth; for the most part three or four shanks on each end, but sometimes also five or six; very often this number is unequal on the two ends.
Dimensions.—Diameter of the central capsules 0.1 to 0.2, length of the spicula 0.05 to 0.15.
Habitat.—Central Pacific, Station 270, surface.
18. Sphærozoum geminatum, n. sp. (Pl. [4], fig. 4).
Spicula all geminate-radiate, with a strong middle rod and a variable number of longer radiant shanks on each end of it. Shanks straight, conical, in the distal half thorny; commonly either three or four shanks on each end of the middle rod, often also three on one end, four on the other end; rarely five or six rays on one end.
Dimensions.—Diameter of the capsules 0.15 to 0.2, length of the spicula 0.05 to 0.1.
Habitat.—Indian Ocean, Ceylon, Haeckel; surface.