Page:Scientific results HMS Challenger vol 18 part 2.djvu/273

Rh columella, simple, three-sided prismatic. Feet twice as long, widely divergent, straight, prismatic, with some irregular basal branches.

Dimensions.—Shell 0.06 diameter, horn 0.05 long, feet 0.1 long.

Habitat.—Central Pacific, Station 266, depth 2750 fathoms.

2. Cladoscenium ancoratum, n. sp. (Pl. 53, fig. 13).

Shell campanulate, smooth, with irregular polygonal pores. Basal plate with six pores (two large cardinal, two smaller jugular and two still smaller cervical pores). Columella with a single verticil of three ascending lateral branches (by mistake not distinct in the figure). Apical horn and the three feet of the same form and size, slender, prismatic, twice to three times as long as the shell, straight, in the distal half with three slender recurved branches, anchor-shaped.

Dimensions.—Shell 0.05 long, 0.04 broad; horn and feet 0.1 to 0.15 long.

Habitat.—Central Pacific, Station 274, depth 2750 fathoms.

3. Cladoscenium gladiatum, n. sp.

Shell subspherical, with irregular polygonal pores. Basal plate with three large pores. Columella with two verticils of three ascending lateral branches. Apical horn as long as the columella, three-sided prismatic. Feet of the same form, twice as long, in the distal half with two opposite transverse branches, sword-shaped.

Dimensions.—Shell 0.05 long, 0.06 broad; horn 0.04 long, feet 0.1 long.

Habitat.—Western Tropical Pacific, Station 225, depth 4475 fathoms.

4. Cladoscenium pinnatum, n. sp.

Shell campanulate, with irregular polygonal pores. Basal plate with four pores (two major cardinal and two minor jugular). Columella with two verticils of three ascending lateral branches, and prolonged into a slender prismatic apical horn of twice the length, which bears four such verticils. Feet twice as long as the horn, pinnate, each with four or five pairs of opposite lateral branches, decreasing towards the thin distal end.

Dimensions.—Shell 0.06 long, 0.05 broad; horn 0.1 long, feet 0.2 long.

Habitat.—Tropical Atlantic, Station 347, depth 2250 fathoms.

5. Cladoscenium verticillatum, n. sp.

Shell campanulate, with subregular square pores. Basal plate with nine pores (three larger central and six smaller distal). Columella with three verticils of three ascending lateral branches. Apical horn and the three basal feet of equal size and similar form, four to six times as long as the columella, three-sided prismatic, each with four to five verticils of three lateral branches, which are