of each chamber. Radial spines between them conical, about as long as the pores. Medullary shells both spherical.
Dimensions.—Main axis 0.14, equatorial axis 0.08; greatest breadth of each chamber 0.1; pores 0.012, bars 0.004.
Habitat.—Pacific, central area, Station 268, depth 2900 fathoms.
8. Cyphonium facettarium, n. sp.
Cortical shell thick walled, with spiny surface; pores subregular, circular, with elevated hexagonal frames, twice as broad as the bars; eight to nine on the half meridian, fourteen to sixteen on the half equator of each chamber. In the corners of the hexagons (between every three meshes) arise radial spines, about twice as long as the pores. Both medullary shells spheroidal compressed. (This species is nearly identical with the internal cortical twin-shell of Peripanartus amphiconiscus, Pl. 40, fig. 5.)
Dimensions.—Main axis 0.12, equatorial axis 0.07; greatest breadth of both chambers 0.09; pores 0.01, bars 0.005, spines 0.02.
Habitat.—Western Tropical Pacific, Station 225, depth 4475 fathoms.
9. Cyphonium cribellum, n. sp. (Pl. 39, fig. 11).
Cortical shell thick walled, with spiny surface; pores regular, circular, about as broad as the bars; seven to eight on the half meridian of each chamber, thirteen to fifteen on its half equator. Radial spines between them conical, twice as long as the pores. Medullary shells both lenticular.
Dimensions.—Main axis 0.11, equatorial axis 0.06; greatest breadth 0.08; pores and bars 0.004.
Habitat.—North Atlantic, Station 353, surface.
10. Cyphonium profundum, Haeckel.
Cortical shell thin walled, with thorny surface; pores irregular, polygonal, three to six times as broad as the thin bars; five to six on the half meridian of each chamber, ten to twelve on its half equator. Thorns of the surface short. Medullary shells both spherical.
Dimensions.—Main axis 0.1, equatorial axis 0.06; greatest breadth 0.07; pores 0.005 to 0.012, bars 0.002, spines 0.005.
Habitat.—Pacific, tropical zone; Philippine Sea, depth 3300 fathoms, Ehrenberg; Stations 266 to 274, depth 2350 to 2925 fathoms.
