Haliomma tenuispinum, Haeckel, 1862, Monogr. d. Radiol., p. 431.
Cortical shell thin walled, three times as broad as the medullary shell. Both shells with very fine, thread-like bars, and regular, hexagonal pores; five to seven on the radius. Twenty radial spines, very thin, bristle-shaped, as long as the radius.
Dimensions.—Diameter of the outer shell 0.12, of the inner 0.04; pores of the former 0.016, of the latter 0.006.
Habitat.—Mediterranean (Nice); North Atlantic, Station 353, surface.
16. Haliomma longispinum, J. Müller.
Haliomma longispinum, J. Müller, 1858, Abhandl. d. k. Akad. d. Wiss. Berlin, p. 39, Taf iv. fig. 8.
Haliomma longispinum, Haeckel, 1862, Monogr. d. Radiol., p. 431.
Cortical shell thick walled, three times as broad as the dark medullary shell. Pores regular, circular, hexagonally framed, twice as broad as the bars; four to six on the radius. Twenty radial spines, very long, regularly disposed, four to five times as long as the diameter of the shell, three-sided prismatic, with elegantly dentated edges, as broad as one cortical mesh.
Dimensions.—Diameter of the outer shell 0.08, of the inner 0.03; pores of the former 0.01, bars 0.005; length of the spines 0.3 to 0.4.
Habitat.—Mediterranean (Nice); Central Pacific, Station 272, surface.