Subgenus 4. Theocapsura, Haeckel.
Definition.—Thorax much smaller than the abdomen, pores of the two different in size or form.
13. Theocapsa lamarckii, n. sp. (Pl. [66], fig. 16).
Shell slenderly ovate, rough, with two distinct strictures. Length of the three joints = 1 : 2 : 7, breadth = 1 : 4 : 5. Cephalis subspherical, with a conical horn of twice the length. Thorax conical, with regular, circular pores. Abdomen three times longer, with subregular, hexagonal pores of twice the size. Basal pole hemispherical, with very large, irregular, roundish pores.
Dimensions.—Length of the three joints, a 0.02, b 0.05, c 0.14; breadth, a 0.03, b 0.08, c 0.1.
Habitat.—Indian Ocean, Madagascar (Rabbe), surface.
14. Theocapsa cuvieri, n. sp. (Pl. [66], fig. 10).
Shell slenderly spindle-shaped, thorny, with two slight strictures. Length of the three joints = 1 : 3 : 6, breadth = 1 : 3 : 3. Cephalis subspherical, with a conical horn of the same length. Thorax conical, spiny, with regular, circular, double-edged pores. Abdomen thinner-walled, inversely conical, with irregular, roundish pores. Basal pole acute, with a bunch of larger spines.
Dimensions.—Length of the three joints, a 0.02, b 0.05, c 0.12; breadth, a 0.02, b 0.05, c 0.06.
Habitat.—South Atlantic, Station 332, depth 2200 fathoms.