Subgenus 2. Anthocyrtonium, Haeckel.
Definition.—Feet of the peristome-corona parallel, vertical; their basal and apical distances equal.
7. Anthocyrtium campanula, n. sp. (Pl. [62], fig. 17).
Shell smooth, with deep collar stricture. Length of the two joints = 1 : 3, breadth = 1 : 3. Cephalis spherical, with a conical horn of the same length. Thorax campanulate, thin-walled, with delicate network of regular, hexagonal pores and thin bars. Mouth little constricted, with twenty to twenty-four parallel, vertical, lanceolate feet, about as long as the cephalis.
Dimensions.—Cephalis 0.03 diameter, thorax 0.09 long, 0.1 broad.
Habitat.—South Pacific, Station 302, depth 1450 fathoms.
8. Anthocyrtium reticulatum, Haeckel.
Thyrsocyrtis reticulata, Ehrenberg, 1875, Abhandl. d. k. Akad. d. Wiss. Berlin, p. 84, Taf. xii. fig. 10.
Shell rough, with sharp collar stricture. Length of the two joints = 1 : 2, breadth = 1 : 3. Cephalis hemispherical, with a prismatic, denticulate horn of the same length, and small, irregular pores. Thorax campanulate, thorny, thin-walled, with delicate network of irregular, polygonal pores. Mouth little constricted, with twelve (or more) small, parallel, vertical, triangular feet, shorter than the cephalis.
Dimensions.—Cephalis 0.015 long, 0.02 broad; thorax 0.04 long, 0.06 broad.