Habitat.—South Pacific, Station 288, surface.
2. Cypassis eucolpos, n. sp.
Inner cortical shell thick walled, with regular, circular pores, twice as broad as the bars (without hexagonal frames); nine to ten on the half meridian of each chamber, fifteen to seventeen on its half equator. Outer cortical shell very thin, with smooth surface, and very small, irregular, roundish pores, twice to three times smaller than those of the inner shell. Distance between the two cortical shells about one and a half times the diameter of the inner medullary shell, which, like the outer, is spherical. (The inner cortical shell resembles that of Cannartiscus amphiconiscus, Pl. [39], fig. 19, but without polar tubes.)
Dimensions.—Main axis of the external cortical shell 0.2, of the internal 0.15; greatest breadth of the former 0.16, of the latter 0.12; pores of the outer 0.002, of the inner 0.006, bars 0.003.
Habitat.—South Atlantic, Station 319, surface.
Subgenus 2. Didymocyrtis, Haeckel (1862).
Definition.—Surface of the cortical shell thorny or spiny.
3. Cypassis entomocora, Haeckel.
Astromma entomocora, Ehrenberg, 1847, Mikrogeol., Taf. xxii. fig. 32.
Haliomma didymum, Ehrenberg, 1844, Monatsber. d. k. preuss. Akad. d. Wiss. Berlin, p. 83.