2. Tridictyopus conulus, n. sp. (Pl. [51], fig. 7).
Shell campanulate conical, about one and a half times as long as broad (excluding horn and feet). Pores mostly triangular, disposed in subregular hexagonal figures, which are separated by bands of smaller irregular polygonal pores. Horn short and stout, three-sided pyramidal. Three feet triangular shovel-shaped, convergent, about one-sixth as long as the shell.
Dimensions.—Shell 0.3 long, 0.2 broad; horn 0.04 long, feet 0.05 long.
Habitat.—Equatorial Atlantic, Station 347, depth 2250 fathoms.
3. Tridictyopus elegans, R. Hertwig.
Tridictyopus elegans, R. Hertwig, 1879, Organismus d. Radiol., p. 75, Taf. vii. fig. 3, 3a, 3b.
Shell slender, conical, campanulate, about twice as long as broad (excluding horn and feet). Most pores subregular triangular, with some irregular polygonal ones intermingled. The horn in the two observed specimens was broken off, together with the conical apex of the shell. Three feet triangular shovel-shaped, about one-sixth as long as the shell.
Dimensions.—Shell 0.3 long, 0.15 broad; feet 0.05 long.
Habitat.—Mediterranean (Messina), R. Hertwig, surface.