Habitat.—West Tropical Pacific, Station 225, depth 4475 fathoms.
6. Heliosphæra coronata, n. sp. (Pl. [26], figs. 6, 6a).
Acanthosphæra coronata, Haeckel, 1881, Atlas.
Shell thick walled, about ten times as broad as one mesh. Pores regular, circular, five times as broad as the bars; each pore surrounded by a regular coronal of six short, conical by-spines (fig. 6a); twenty to thirty main spines, also conical, half as long as the radius, as broad as one pore.
Dimensions.—Diameter of the shell 0.15, pores 0.015, bars 0.003; length of the main spines 0.04, basal breadth 0.015.
Habitat.—Central Pacific, Station 272, depth 2600 fathoms.
7. Heliosphæra floribunda, n. sp.
Shell thick walled about ten times as broad as one mesh. Pores regular, six-lobed, twice as broad as the bars; each pore surrounded by six small conical by-spines (as in Pl. [28], figs. 1, 1b); twenty main spines regularly disposed cylindro-conical, as long as the diameter of the shell or longer.
Dimensions.—Diameter of the shell 0.15, pores 0.015, bars 0.008; length of the main spines 0.16, breadth 0.008.
Habitat.—Central Pacific, Station 268, depth 2900 fathoms.