Habitat.—South Atlantic (Tristan da Cunha), Station 332, depth 2200 fathoms.
5. Haliomma melitomma, n. sp. (Pl. [20], fig. 4).
Melitomma formosum, Haeckel, 1879, Atlas, loc. cit.
Cortical shell thick walled, two and a half times as broad as the medullary shell, with regular pores of very elegant structure, twice as broad as the bars; eight to ten on the radius. The inner opening of each pore is simple, circular, the outer regular, six-lobed; corresponding to the six lobes are six short conical spines, which arise from the six corners of the regular hexagonal frames separating the pores. Pores of the medullary shell simple, circular, of the same breadth as the bars. The two shells connected only by six radial beams (in three dimensive axes).
Dimensions.—Diameter of the outer shell 0.17, of the inner 0.07; pores of the former 0.012, of the latter 0.004; length of the spines 0.005 to 0.01.
Habitat.—Indian Ocean, Zanzibar, Pullen, depth 2200 fathoms.
6. Haliomma lirianthus, n. sp. (Pl. [28], figs. 1, 1a, 1b).
Cortical shell thick walled, three times as broad as the medullary shell, with regular, rosette-shaped pores, twice as broad as the bars; eight to ten on the radius. The regular structure of the elegant pores is the same as in the preceding species, but without prominent crested frames (fig. 1b). Also the medullary shell (fig. 1a) is different, much thinner and smaller, with simple, circular pores, which are three times as broad as the bars. The two shells are connected by numerous (twenty?) radial beams.
Dimensions.—Diameter of the outer shell 0.15, of the inner 0.05; pores of the former 0.01, of the latter 0.005; length of the spines 0.005 to 0.02.
Habitat.—Central Pacific, Station 271, depth 2425 fathoms.