1. Cannosphæra atlantica, n. sp. (Pl. [112], figs. 5, 6).
Internal shell not mammillate, with fifteen to twenty radial rods, which are loosely studded with single, scattered, simple, lateral spines. External shell with irregular, mostly hexagonal meshes, armed with numerous scattered forks of paired divergent spines, and with twenty to thirty larger simple radial spines, which are about half as long as the internal rods, and bear at the distal end a verticil of three to five curved, simple, terminal branches.
Dimensions.—Diameter of the inner shell 0.1, of the outer 0.5.
Habitat.—Tropical Atlantic, Stations 347 to 349, depth 2250 to 2450 fathoms.
2. Cannosphæra antarctica, n. sp. (Pl. [112], figs. 1-3).
Internal shell mammillate, with sixty to ninety radial rods, which are studded with cruciate verticils of tridentate anchor-threads. External shell with irregular, mostly pentagonal meshes, the bars of which bear on the outside bunches of similar tridentate anchor-threads. At each nodal point arises a simple, smooth, radial spine, which bears at the distal end a verticil of three or four small, curved, terminal branches.
Dimensions.—Diameter of the inner shell 0.2 to 0.3, of the outer 1.5 to 2.0.
Habitat.—Antarctic Ocean, Stations 154 to 157, depth 1300 to 1975 fathoms.
3. Cannosphæra pacifica, n. sp. (Pl. [112], fig. 4).
Internal shell mammillate, with one hundred to one hundred and twenty radial rods, which are studded with cruciate verticils of tridentate anchor-threads. External shell with irregular, mostly hexagonal meshes, the bars of which bear on the outside and on the inside bunches of similar tridentate anchor-threads. At each nodal point arises a simple, thorny, radial spine, which bears at the distal end an elegant verticil of fifteen to twenty flatly expanded, thin, terminal branches.