Habitat.—Pacific, central area, Stations 271 to 274, depth 2350 to 2750 fathoms.
Subgenus 3. Ommatocorona, Haeckel.
Definition.—Surface of the cortical shell spiny, on every chamber a regular circle or coronal of radial spines.
6. Ommatocampe chætopodum, n. sp.
Cortical shell with spiny surface, composed of six (or more) kidney-shaped chambers of different size and form. Both proximal chambers kidney-shaped, with subregular, circular, hexagonally framed pores, about as broad as the bars. All the following chambers hemispherical, with irregular, roundish pores; at the base of every chamber a circle of ten to twelve larger square pores. The beams between these latter are prolonged into free radial spines, twice as thick as the bars. Therefore every chamber is surrounded by a circle of radial spines, like those of Panicium coronatum (Pl. [40], fig. 4). Both medullary shells lenticular.
Dimensions.—Length of the six-chambered cortical shell 0.3, greatest breadth 0.08, pores and bars of both proximal chambers 0.01; pores of the other chambers 0.002 to 0.008; square pores 0.02, bars 0.005; length of the coronal spines 0.03, thickness 0.01.
Habitat.—Indian Ocean, Madagascar, Rabbe.
Subgenus 4. Ommatacantha, Haeckel.
Definition.—Surface of the shell smooth or spiny, on the poles of the main axis occur two strong opposite polar spines.
7. Ommatocampe amphilonche, n. sp.