Radial spines cylindrical, smooth, irregularly curved, two to three times as long as the diameter of the polyhedral shell, twice as broad as its smooth bars, bearing numerous irregular, lateral branches, which are partly confluent and fenestrated (similarly as in Pl. [107], fig. 1), but not forming an outer lattice-shell. Meshes irregularly polygonal.
Dimensions.—Diameter of the shell 3.3, length of the spines 6 to 9, breadth 0.03.
Habitat.—Tropical Atlantic, Station 347, depth 2250 fathoms.
11. Orosphæra arborescens, n. sp. (Pl. [106], fig. 3).
Orothamnus arborescens, Haeckel, 1881, Atlas, loc. cit.
Radial spines cylindrical, rough, more or less curved, somewhat longer than the diameter of the subspherical or slightly ellipsoidal shell, and at the thicker base three times as broad as its smooth bars, bearing numerous irregularly branched and curved, sometimes confluent, lateral branches. Meshes irregularly quadrangular.
Dimensions.—Diameter of the shell 1.2 to 1.6, length of the spines 1.5 to 2.2, breadth 0.06.
Habitat.—South Atlantic, Station 335, depth 1425 fathoms.
Genus 673. Oroscena,[[291]] n. gen.
Definition.—Orosphærida with a simple, polyhedral or subspherical lattice-shell, and with numerous pyramidal elevations on its surface, the top of which bears a radial spine.