Page:Scientific results HMS Challenger vol 18 part 2.djvu/398

1274 twenty divergent, broad, lamellar, rectangular feet, as long as the thorax, and so densely placed that their margins come in contact with one another.

Dimensions.—Cephalis 0.03 long, 0.04 broad; thorax 0.1 long, 0.12 broad.

Habitat.—Central Pacific, Station 263 to 268, depth 2650 to 3000 fathoms.

6. Anthocyrtium anemone, n. sp.

Shell spiny, with sharp collar stricture. Length of the two joints = 1 : 5, breadth = 1 : 4. Cephalis subspherical, with a conical horn of half the length, hyaline, without pores. Thorax spiny, pear-shaped, inflated, with small and numerous, regular, circular pores. Mouth constricted, half as broad as the thorax, with twelve to fifteen divergent, slender, conical, denticulate feet, half as long as the thorax.

Dimensions.—Cephalis 0.03 long, 0.04 broad; thorax 0.14 long, 0.12 broad.

Habitat.—Tropical Atlantic, Station 347, depth 2250 fathoms; also fossil in Barbados.

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.

Habitat.—Fossil in Barbados.