Cap-shaped pieces of the skeleton flatly vaulted, three times as broad as high, rough, covered with numerous small spinules; the marginal ring with stout radial ribs and a corona of denticles on the margin.
Dimensions.—Breadth of the concave caps 0.03, height 0.01.
Habitat.—South Atlantic, Station 332, depth 2200 fathoms.
3. Catinulus lopadium, n. sp.
Cap-shaped pieces of the skeleton hemispherical, twice as broad as high, smooth; the marginal ring smooth, slightly radiate, with thickened smooth margin.
Dimensions.—Diameter of the calymma 1.2, of the central capsule 0.22; breadth of the concave caps 0.024, height 0.012.
Habitat.—Tropical Atlantic, Station 347, depth 2250 fathoms.
Subfamily 3. Dictyochida, Haeckel.
Definition.—Cannorrhaphida with a skeleton composed of numerous annular pieces, which lie tangentially scattered on the surface of the calymma. Each piece is either a simple hollow ring or a pileate and reticulate cap, composed of a ring and several connected bars.