Habitat.—Central Pacific, Station 265, depth 2900 fathoms.
6. Ethmosphæra leptosiphonia, n. sp.
Tubuli cylindrical, short, about as long as broad, very thin-walled and fragile, separated by wide distances, which are three times as large as their diameter. Six to seven pores on the quadrant. (Very similar to Siphonosphæra cyathina, Pl. [6], fig. 10, but quite regular, all tubuli retaining the same size and distance.)
Dimensions.—Diameter of the shell 0.12, outer pores 0.01, their distance 0.03.
Habitat.—North Atlantic, Færöe Channel, John Murray; surface.
7. Ethmosphæra macrosiphonia, n. sp.
Tubuli cylindrical, very elongated, four times as long as broad; their bases separated by distances which are equal to their breadth. Eight to ten tubuli on the quadrant. (The tubes are similar to those of Siphonosphæra serpula, Pl. [6], fig. 6, but quite regular, straight, not curved, all of the same size and at equal distances apart.)
Dimensions.—Diameter of the shell 0.1, length of the tubes 0.04, breadth 0.01, basal distance 0.01.
Habitat.—Indian Ocean, Cocos Islands, surface, Rabbe.