Habitat.—Mediterranean (Messina), surface, Haeckel.
4. Heliosphæra elegans, Haeckel.
Heliosphæra elegans, Haeckel, 1862, Monogr. d. Radiol., p. 353, Taf. ix. fig. 5.
Shell very thin walled, about ten times as broad as one mesh. Pores regular, hexagonal, with thread-like bars, which are crossed by tangential bars, so that each side of a hexagon exhibits a regular rectangular cross (exactly the same as in Pl. [19], fig. 5). All radial spines bristle-shaped, as thin as the bars, and arising from the nodal-points; twenty main spines as long as the radius, numerous by-spines scarcely one-sixth as long.
Dimensions.—Diameter of the shell 0.26, pores 0.026, bars below 0.001; length of the main spines 0.13.
Habitat.—Mediterranean (Messina), surface, Haeckel.
5. Heliosphæra pectinata, n. sp. (Pl. [26], fig. 9).
Acanthosphæra pectinata, Haeckel, 1881, Atlas.
Shell thick walled, combed, about fourteen times as broad as one mesh. Pores subregular, circular, with elevated hexagonal frames, three times as broad as the bars. Radial spines very numerous and stout; thirty to forty main spines, three-sided pyramidal, nearly as long as the radius, as broad as one mesh; by-spines small, conical, everywhere scattered at the nodal-points of the network and on the high combs of the bars.
Dimensions.—Diameter of the shell 0.16, pores 0.012, bars 0.004; length of the main spines 0.07, basal breadth 0.016.