3. Coscinomma macrosiphon, n. sp.
Pores regular, circular, without hexagonal frames, of the same breadth as the bars, prolonged on the outside of the shell into a long cylindrical tube, half as long as the radius (eight to nine pores on the radius); between them bristle-shaped, at the base conical, radial spines of double length.
Dimensions.—Diameter of the shell 0.16, pores and bars 0.008; length of the spines 0.08, of the tubes 0.04.
Habitat.—Central Pacific, Station 274, surface.
Subgenus 3. Coscinommonium, Haeckel.
Definition.—Pores prolonged into internal tubes on the inside of the shell.
4. Coscinomma endosiphon, n. sp.
Pores regular, circular, hexagonally framed, twice as broad as the bars (fourteen to sixteen on the radius), prolonged on the inside of the shell into a short truncated cylindrical tube. In each hexagon-corner arises a thin, bristle-shaped, radial spine with pyramidal base, half as long as the radius, twice as long as the tube.
Dimensions.—Diameter of the shell 0.25, pores 0.012, bars 0.006; length of the spines 0.066, of the tubes 0.03.
Habitat.—South Pacific, Station 288, surface.