5. Theoconus orthoconus, n. sp.
Shell perfectly conical, smooth. Length of the three joints = 1 : 2 : 3, breadth = 1 : 2 : 4. Cephalis hemispherical, with a strong, straight, conical horn of the same length. Thorax conical, without external girdle stricture, prolonged into the truncated, conical abdomen, which is gradually dilated into a very wide mouth. Pores small, of nearly equal size and similar form, of the same breadth as the bars.
Dimensions.—Length of the three joints, a 0.03, b 0.06, c 0.09; breadth, a 0.03, b 0.06, c 0.12.
Habitat.—Cosmopolitan; Atlantic, Pacific; many stations, at different depths.
Subgenus 2. Theocorbis, Haeckel.
Definition.—Pores of the thorax and of the abdomen of different sizes or dissimilar forms.
6. Theoconus jovis, n. sp. (Pl. [69], fig. 4).
Shell bell-shaped, nearly conical. Length of the three joints = 5 : 6 : 7, breadth = 4 : 10 : 14. Cephalis nearly cylindrical, large, little curved, with a very large, oblique, pyramidal horn, as long as the two first joints together. Thorax and the broader abdomen irregularly bell-shaped, dilated towards the wide mouth. Pores circular, somewhat irregularly disposed, gradually increasing in size towards the mouth.
Dimensions.—Length of the three joints, a 0.05, b 0.06, c 0.07; breadth, a 0.04, b 0.1, c 0.14.
Habitat.—Central Pacific, Station 272, depth 2600 fathoms.