Pyramids subregular, of equal size and similar form, usually three-sided, crowned at the top with three divergent apical spines, which alternate with the three edges of the pyramids and bear a small spinulate terminal knob. (Some four-sided and single five-sided pyramids are often intermingled with the three-sided.)
Dimensions.—Diameter of the sphere 1.7 to 2.3, length of the bars 0.2 to 0.25, breadth 0.008.
Habitat.—South-Eastern Pacific, Stations 295, 296, surface.
2. Sagoscena tentorium, n. sp. (Pl. [108], fig. 6).
Pyramids subregular, of equal size and similar form, usually four-sided, crowned at the top with three divergent apical spines, which are trifurcate at the distal end. (Some three-sided and five-sided pyramids are often intermingled with the four-sided.)
Dimensions.—Diameter of the sphere 2.2, length of the bars 0.2 to 0.25, breadth 0.005.
Habitat.—South Pacific, Station 291, surface.
3. Sagoscena prætorium, n. sp. (Pl. [108], fig. 7).
Pyramids subregular, of equal size and similar form, usually four-sided, crowned at the distal top with three or four divergent apical spines, which bear some irregular verticils of lateral and terminal branches. (Some five-sided and some six-sided pyramids are often intermingled with the four-sided.)
Dimensions.—Diameter of the sphere 2.6, length of the bars 0.3, breadth 0.006.